91379520 has 84 divisors (see below), whose sum is σ = 314317380. Its totient is φ = 24367104.

The previous prime is 91379513. The next prime is 91379543. The reversal of 91379520 is 2597319.

It can be written as a sum of positive squares in 2 ways, for example, as 64256256 + 27123264 = 8016^2 + 5208^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 12985 + ... + 18744.

Almost surely, 2^91379520 is an apocalyptic number.

91379520 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91379520 is an abundant number, since it is smaller than the sum of its proper divisors (222937860).

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

91379520 is a wasteful number, since it uses less digits than its factorization.

91379520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31752 (or 31739 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 91379520 is about 9559.2635699619. The cubic root of 91379520 is about 450.4185735005.

The spelling of 91379520 in words is "ninety-one million, three hundred seventy-nine thousand, five hundred twenty".