18878721024 has 88 divisors (see below), whose sum is σ = 52967189440. Its totient is φ = 5961682944.

The previous prime is 18878721007. The next prime is 18878721053. The reversal of 18878721024 is 42012787881.

It is a super-2 number, since 2×18878721024² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103354 + ... + 220089.

It is an arithmetic number, because the mean of its divisors is an integer number (601899880).

Almost surely, 2^18878721024 is an apocalyptic number.

It is an amenable number.

18878721024 is an abundant number, since it is smaller than the sum of its proper divisors (34088468416).

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

18878721024 is a wasteful number, since it uses less digits than its factorization.

18878721024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323485 (or 323467 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 48.

The spelling of 18878721024 in words is "eighteen billion, eight hundred seventy-eight million, seven hundred twenty-one thousand, twenty-four".