A refactorable number or tau number is an integer n that is divisible by the count of its divisors, or to put it algebraically, n is such that τ ( n )...

parts The flight number of Air France Flight 447 448 = 26 × 7, untouchable number, refactorable number, Harshad number A prime number, sum of five consecutive...

107), Harshad number, number of partitions of 34 into Fibonacci parts 804 = 22 × 3 × 67, nontotient, Harshad number, refactorable number "The 804" is a...

the number of complete compositions of 11. 516 = 22 × 3 × 43, it is: nontotient. untouchable number. refactorable number. a Harshad number. 517 = 11...

octahedral number, noncototient, totient sum of the first 33 integers, refactorable number. 345 = 3 × 5 × 23, sphenic number, idoneal number 346 = 2 ×...

triangular number, centered hexagonal number, Chen prime, lazy caterer number (sequence A000124 in the OEIS) 632 = 23 × 79, refactorable number, number of 13-bead...

a refactorable number, since 8 is one of its 8 divisors. The sum of the sums of the divisors of the first 8 positive integers. A semiperfect number, since...

natural number following 95 and preceding 97. It is a number that appears the same when rotated by 180 degrees. 96 is: an octagonal number. a refactorable number...

(other than 1) whose square root is also a triangular number. 36 is also the eighth refactorable number, as it has exactly nine positive divisors, and 9 is...

natural number following 87 and preceding 89. 88 is: a refactorable number. a primitive semiperfect number. an untouchable number. a hexadecagonal number. an...

composite number, the smallest abundant number, a semiperfect number, a highly composite number, a refactorable number, and a Pell number. It is the...

Schröder–Hipparchus number, Mertens function(903) returns 0, little Schroeder number 904 = 23 × 113 or 113 × 8, refactorable number, Mertens function(904)...

712 = 23 × 89, refactorable number, sum of the first twenty-one primes, totient sum for first 48 integers. It is the largest known number such that it and...

is the natural number following 135 and preceding 137. 136 is: a refactorable number and a composite number. the 16th triangular number. a repdigit in...

is the natural number following 247 and preceding 249. Additionally, 248 is: a nontotient. a refactorable number. an untouchable number. palindromic in...

expressed as the sum of some of 180's divisors. 180 is a Harshad number and a refactorable number. 180 is the sum of two square numbers: 122 + 62. It can be...

[and] four) is the natural number following 103 and preceding 105. 104 is a refactorable number and a primitive semiperfect number. The smallest known 4-regular...

integer with 152 coprimes below it. 152 is a refactorable number since it is divisible by the total number of divisors it has, and in base 10 it is divisible...

function, which is 36. divisible by the total number of its divisors (12), hence it is a refactorable number. the angle in degrees of the interior angles...

superior highly composite number, the 6th colossally abundant number, a refactorable number, a 5-smooth number, and a Harshad number in decimal since the sum...

squares. However, it is divisible by the total number of its divisors, making it a refactorable number. The sum of Euler's totient function φ(x) over...

member in the sequence of refactorable numbers. As no smaller number has more than 12 divisors, 72 is a largely composite number. 72 has an Euler totient...

the latter. 9 is the fourth composite number, and the first odd composite number. 9 is also a refactorable number. Casting out nines is a quick way of...

11-gonal number. It is also a refactorable number, a Motzkin sum, an idoneal number, a Riordan number and a noncototient. 232 is a telephone number: in a...

refactorable number, preceding the triangular 136. 132 is an oblong number, as the product of 11 and 12 whose sum instead yields the 9th prime number...

[and] four) is the natural number following 203 and preceding 205. 204 is a refactorable number. 204 is a square pyramidal number: 204 balls may be stacked...

natural number, following 155 and preceding 157. 156 is an abundant number, a pronic number, a dodecagonal number, and a refactorable number. 156 is the...

with 20 divisors in total, more than any smaller number; and a refactorable number or tau number, since one of its divisors is 20, which divides 240...

the same square twice. 184 is also a refactorable number. Some physicists have proposed that 184 is a magic number for neutrons in atomic nuclei. All pages...

twenty-eight) is the natural number following 227 and preceding 229. 228 is a refactorable number and a practical number. There are 228 matchings in a...