91813488 has 40 divisors (see below), whose sum is σ = 255431568. Its totient is φ = 28250112.

The previous prime is 91813483. The next prime is 91813511. The reversal of 91813488 is 88431819.

It is a super-2 number, since 2×91813488² = 16859433157452288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91813483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72945 + ... + 74192.

Almost surely, 2^91813488 is an apocalyptic number.

It is an amenable number.

91813488 is an abundant number, since it is smaller than the sum of its proper divisors (163618080).

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

91813488 is a wasteful number, since it uses less digits than its factorization.

91813488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147161 (or 147155 counting only the distinct ones).

The product of its digits is 55296, while the sum is 42.

The square root of 91813488 is about 9581.9355038531. The cubic root of 91813488 is about 451.1304712792.

The spelling of 91813488 in words is "ninety-one million, eight hundred thirteen thousand, four hundred eighty-eight".