91855904 has 48 divisors (see below), whose sum is σ = 212280768. Its totient is φ = 38299392.

The previous prime is 91855891. The next prime is 91855919. The reversal of 91855904 is 40955819.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2747 + ... + 13829.

It is an arithmetic number, because the mean of its divisors is an integer number (4422516).

Almost surely, 2^91855904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91855904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106140384).

91855904 is an abundant number, since it is smaller than the sum of its proper divisors (120424864).

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

91855904 is a wasteful number, since it uses less digits than its factorization.

91855904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11137 (or 11129 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 91855904 is about 9584.1485798166. The cubic root of 91855904 is about 451.1999316768.

The spelling of 91855904 in words is "ninety-one million, eight hundred fifty-five thousand, nine hundred four".