91557856 has 48 divisors (see below), whose sum is σ = 195761664. Its totient is φ = 41900544.

The previous prime is 91557853. The next prime is 91557857. The reversal of 91557856 is 65875519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91557853) 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, 51966 + ... + 53698.

It is an arithmetic number, because the mean of its divisors is an integer number (4078368).

Almost surely, 2^91557856 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 91557856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97880832).

91557856 is an abundant number, since it is smaller than the sum of its proper divisors (104203808).

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

91557856 is a wasteful number, since it uses less digits than its factorization.

91557856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883 (or 1875 counting only the distinct ones).

The product of its digits is 378000, while the sum is 46.

The square root of 91557856 is about 9568.5869385192. The cubic root of 91557856 is about 450.7113949436.

The spelling of 91557856 in words is "ninety-one million, five hundred fifty-seven thousand, eight hundred fifty-six".