91256628 has 12 divisors (see below), whose sum is σ = 212932160. Its totient is φ = 30418872.

The previous prime is 91256603. The next prime is 91256651. The reversal of 91256628 is 82665219.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3802348 + ... + 3802371.

Almost surely, 2^91256628 is an apocalyptic number.

It is an amenable number.

91256628 is an abundant number, since it is smaller than the sum of its proper divisors (121675532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91256628 is a wasteful number, since it uses less digits than its factorization.

91256628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7604726 (or 7604724 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 91256628 is about 9552.8335063477. The cubic root of 91256628 is about 450.2165673628.

It can be divided in two parts, 9125 and 6628, that added together give a triangular number (15753 = T₁₇₇).

The spelling of 91256628 in words is "ninety-one million, two hundred fifty-six thousand, six hundred twenty-eight".