91321344 has 132 divisors (see below), whose sum is σ = 274199744. Its totient is φ = 30357504.

The previous prime is 91321333. The next prime is 91321357. The reversal of 91321344 is 44312319.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 248649 + ... + 249015.

Almost surely, 2^91321344 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 91321344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137099872).

91321344 is an abundant number, since it is smaller than the sum of its proper divisors (182878400).

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

91321344 is an equidigital number, since it uses as much as digits as its factorization.

91321344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 372 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 91321344 is about 9556.2201732693. The cubic root of 91321344 is about 450.3229681480.

The spelling of 91321344 in words is "ninety-one million, three hundred twenty-one thousand, three hundred forty-four".