91888056 has 96 divisors (see below), whose sum is σ = 270466560. Its totient is φ = 28014336.

The previous prime is 91888001. The next prime is 91888063. The reversal of 91888056 is 65088819.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118486 + ... + 119258.

It is an arithmetic number, because the mean of its divisors is an integer number (2817360).

Almost surely, 2^91888056 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 91888056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135233280).

91888056 is an abundant number, since it is smaller than the sum of its proper divisors (178578504).

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

91888056 is a wasteful number, since it uses less digits than its factorization.

91888056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925 (or 918 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 91888056 is about 9585.8257860239. The cubic root of 91888056 is about 451.2525695124.

The spelling of 91888056 in words is "ninety-one million, eight hundred eighty-eight thousand, fifty-six".