91088972 has 36 divisors (see below), whose sum is σ = 174134016. Its totient is φ = 41670720.

The previous prime is 91088909. The next prime is 91089001. The reversal of 91088972 is 27988019.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85322 + ... + 86382.

It is an arithmetic number, because the mean of its divisors is an integer number (4837056).

Almost surely, 2^91088972 is an apocalyptic number.

It is an amenable number.

91088972 is a deficient number, since it is larger than the sum of its proper divisors (83045044).

91088972 is a wasteful number, since it uses less digits than its factorization.

91088972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218 (or 1203 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 91088972 is about 9544.0542747828. The cubic root of 91088972 is about 449.9406868327.

The spelling of 91088972 in words is "ninety-one million, eighty-eight thousand, nine hundred seventy-two".