91855608 has 128 divisors (see below), whose sum is σ = 259828800. Its totient is φ = 26873856.

The previous prime is 91855579. The next prime is 91855609. The reversal of 91855608 is 80655819.

It is a self number, because there is not a number n which added to its sum of digits gives 91855608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91855609) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 842658 + ... + 842766.

Almost surely, 2^91855608 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 91855608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129914400).

91855608 is an abundant number, since it is smaller than the sum of its proper divisors (167973192).

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

91855608 is a wasteful number, since it uses less digits than its factorization.

91855608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 91855608 is about 9584.1331376395. The cubic root of 91855608 is about 451.1994470216.

The spelling of 91855608 in words is "ninety-one million, eight hundred fifty-five thousand, six hundred eight".