18928872864 has 72 divisors (see below), whose sum is σ = 58722535872. Its totient is φ = 5736021120.

The previous prime is 18928872857. The next prime is 18928872889. The reversal of 18928872864 is 46827882981.

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2984344 + ... + 2990679.

It is an arithmetic number, because the mean of its divisors is an integer number (815590776).

Almost surely, 2^18928872864 is an apocalyptic number.

It is an amenable number.

18928872864 is an abundant number, since it is smaller than the sum of its proper divisors (39793663008).

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

18928872864 is a wasteful number, since it uses less digits than its factorization.

18928872864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5975050 (or 5975039 counting only the distinct ones).

The product of its digits is 24772608, while the sum is 63.

The spelling of 18928872864 in words is "eighteen billion, nine hundred twenty-eight million, eight hundred seventy-two thousand, eight hundred sixty-four".