91621656 has 48 divisors (see below), whose sum is σ = 283592400. Its totient is φ = 26177472.

The previous prime is 91621637. The next prime is 91621679. The reversal of 91621656 is 65612619.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 91621656.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90391 + ... + 91398.

It is an arithmetic number, because the mean of its divisors is an integer number (5908175).

Almost surely, 2^91621656 is an apocalyptic number.

It is an amenable number.

91621656 is an abundant number, since it is smaller than the sum of its proper divisors (191970744).

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

91621656 is a wasteful number, since it uses less digits than its factorization.

91621656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181808 (or 181801 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 91621656 is about 9571.9201835368. The cubic root of 91621656 is about 450.8160599487.

The spelling of 91621656 in words is "ninety-one million, six hundred twenty-one thousand, six hundred fifty-six".