91557960 has 128 divisors (see below), whose sum is σ = 311472000. Its totient is φ = 21344256.

The previous prime is 91557899. The next prime is 91558007. The reversal of 91557960 is 6975519.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28096 + ... + 31184.

It is an arithmetic number, because the mean of its divisors is an integer number (2433375).

Almost surely, 2^91557960 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 91557960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155736000).

91557960 is an abundant number, since it is smaller than the sum of its proper divisors (219914040).

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

91557960 is a wasteful number, since it uses less digits than its factorization.

91557960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3135 (or 3131 counting only the distinct ones).

The product of its (nonzero) digits is 85050, while the sum is 42.

The square root of 91557960 is about 9568.5923729669. The cubic root of 91557960 is about 450.7115655970.

The spelling of 91557960 in words is "ninety-one million, five hundred fifty-seven thousand, nine hundred sixty".