91642120704 has 60 divisors (see below), whose sum is σ = 264485378586. Its totient is φ = 30547372032.

The previous prime is 91642120651. The next prime is 91642120763. The reversal of 91642120704 is 40702124619.

It is a happy number.

91642120704 is a `hidden beast` number, since 9 + 1 + 642 + 1 + 2 + 0 + 7 + 0 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 91590969600 + 51151104 = 302640^2 + 7152^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9939199 + ... + 9948414.

Almost surely, 2^91642120704 is an apocalyptic number.

It is an amenable number.

91642120704 is an abundant number, since it is smaller than the sum of its proper divisors (172843257882).

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

91642120704 is a wasteful number, since it uses less digits than its factorization.

91642120704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19887637 (or 19887618 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 91642120704 in words is "ninety-one billion, six hundred forty-two million, one hundred twenty thousand, seven hundred four".