91557996 has 24 divisors (see below), whose sum is σ = 215269824. Its totient is φ = 30285840.

The previous prime is 91557899. The next prime is 91558007. The reversal of 91557996 is 69975519.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27550 + ... + 30693.

It is an arithmetic number, because the mean of its divisors is an integer number (8969576).

Almost surely, 2^91557996 is an apocalyptic number.

It is an amenable number.

91557996 is an abundant number, since it is smaller than the sum of its proper divisors (123711828).

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

91557996 is a wasteful number, since it uses less digits than its factorization.

91557996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58381 (or 58379 counting only the distinct ones).

The product of its digits is 765450, while the sum is 51.

The square root of 91557996 is about 9568.5942541211. The cubic root of 91557996 is about 450.7116246693.

The spelling of 91557996 in words is "ninety-one million, five hundred fifty-seven thousand, nine hundred ninety-six".