91400320 has 64 divisors (see below), whose sum is σ = 238386240. Its totient is φ = 33233920.

The previous prime is 91400311. The next prime is 91400329. The reversal of 91400320 is 2300419.

It is an interprime number because it is at equal distance from previous prime (91400311) and next prime (91400329).

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×91400320² = 16708036992204800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91400329) 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, 549 + ... + 13531.

It is an arithmetic number, because the mean of its divisors is an integer number (3724785).

Almost surely, 2^91400320 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 91400320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119193120).

91400320 is an abundant number, since it is smaller than the sum of its proper divisors (146985920).

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

91400320 is a wasteful number, since it uses less digits than its factorization.

91400320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13013 (or 13001 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 91400320 is about 9560.3514579748. The cubic root of 91400320 is about 450.4527459846.

Adding to 91400320 its reverse (2300419), we get a palindrome (93700739).

The spelling of 91400320 in words is "ninety-one million, four hundred thousand, three hundred twenty".