91625646 has 32 divisors (see below), whose sum is σ = 216188928. Its totient is φ = 25333920.

The previous prime is 91625621. The next prime is 91625659. The reversal of 91625646 is 64652619.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33885 + ... + 36488.

It is an arithmetic number, because the mean of its divisors is an integer number (6755904).

Almost surely, 2^91625646 is an apocalyptic number.

91625646 is an abundant number, since it is smaller than the sum of its proper divisors (124563282).

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

91625646 is a wasteful number, since it uses less digits than its factorization.

91625646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70416.

The product of its digits is 77760, while the sum is 39.

The square root of 91625646 is about 9572.1286033985. The cubic root of 91625646 is about 450.8226039983.

It can be divided in two parts, 916 and 25646, that added together give a palindrome (26562).

The spelling of 91625646 in words is "ninety-one million, six hundred twenty-five thousand, six hundred forty-six".