91915620 has 48 divisors (see below), whose sum is σ = 265671168. Its totient is φ = 23719680.

The previous prime is 91915591. The next prime is 91915657. The reversal of 91915620 is 2651919.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22849 + ... + 26568.

It is an arithmetic number, because the mean of its divisors is an integer number (5534816).

Almost surely, 2^91915620 is an apocalyptic number.

It is an amenable number.

91915620 is an abundant number, since it is smaller than the sum of its proper divisors (173755548).

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

91915620 is a wasteful number, since it uses less digits than its factorization.

91915620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49460 (or 49458 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 91915620 is about 9587.2634260252. The cubic root of 91915620 is about 451.2976863022.

The spelling of 91915620 in words is "ninety-one million, nine hundred fifteen thousand, six hundred twenty".