91088920 has 64 divisors (see below), whose sum is σ = 224532000. Its totient is φ = 33051648.

The previous prime is 91088909. The next prime is 91089001. The reversal of 91088920 is 2988019.

It is a self number, because there is not a number n which added to its sum of digits gives 91088920.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29196 + ... + 32164.

Almost surely, 2^91088920 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 91088920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112266000).

91088920 is an abundant number, since it is smaller than the sum of its proper divisors (133443080).

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

91088920 is a wasteful number, since it uses less digits than its factorization.

91088920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3052 (or 3048 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 91088920 is about 9544.0515505733. The cubic root of 91088920 is about 449.9406012134.

The spelling of 91088920 in words is "ninety-one million, eighty-eight thousand, nine hundred twenty".