91572623964 has 18 divisors (see below), whose sum is σ = 231475244000. Its totient is φ = 30524207976.

The previous prime is 91572623851. The next prime is 91572623983. The reversal of 91572623964 is 46932627519.

91572623964 is a `hidden beast` number, since 9 + 1 + 5 + 7 + 2 + 623 + 9 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 91572623964.

It is a congruent number.

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, 1271841964 + ... + 1271842035.

Almost surely, 2^91572623964 is an apocalyptic number.

It is an amenable number.

91572623964 is an abundant number, since it is smaller than the sum of its proper divisors (139902620036).

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

91572623964 is a wasteful number, since it uses less digits than its factorization.

91572623964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543684009 (or 2543684004 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The spelling of 91572623964 in words is "ninety-one billion, five hundred seventy-two million, six hundred twenty-three thousand, nine hundred sixty-four".