91136256 has 72 divisors (see below), whose sum is σ = 247242240. Its totient is φ = 29792256.

The previous prime is 91136251. The next prime is 91136263. The reversal of 91136256 is 65263119.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (91136251) 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, 39585 + ... + 41823.

It is an arithmetic number, because the mean of its divisors is an integer number (3433920).

Almost surely, 2^91136256 is an apocalyptic number.

91136256 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91136256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123621120).

91136256 is an abundant number, since it is smaller than the sum of its proper divisors (156105984).

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

91136256 is a wasteful number, since it uses less digits than its factorization.

91136256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2311 (or 2297 counting only the distinct ones).

The product of its digits is 9720, while the sum is 33.

The square root of 91136256 is about 9546.5310977339. The cubic root of 91136256 is about 450.0185276322.

The spelling of 91136256 in words is "ninety-one million, one hundred thirty-six thousand, two hundred fifty-six".