91216256 has 32 divisors (see below), whose sum is σ = 184297680. Its totient is φ = 44961280.

The previous prime is 91216249. The next prime is 91216261. The reversal of 91216256 is 65261219.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4070 + ... + 14106.

Almost surely, 2^91216256 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 91216256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92148840).

91216256 is an abundant number, since it is smaller than the sum of its proper divisors (93081424).

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

91216256 is a wasteful number, since it uses less digits than its factorization.

91216256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10122 (or 10110 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 91216256 is about 9550.7201822690. The cubic root of 91216256 is about 450.1501655219.

The spelling of 91216256 in words is "ninety-one million, two hundred sixteen thousand, two hundred fifty-six".