18904057812 has 36 divisors (see below), whose sum is σ = 48801969216. Its totient is φ = 6167280720.

The previous prime is 18904057741. The next prime is 18904057849. The reversal of 18904057812 is 21875040981.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5584614 + ... + 5587997.

It is an arithmetic number, because the mean of its divisors is an integer number (1355610256).

Almost surely, 2^18904057812 is an apocalyptic number.

18904057812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18904057812 is an abundant number, since it is smaller than the sum of its proper divisors (29897911404).

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

18904057812 is a wasteful number, since it uses less digits than its factorization.

18904057812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11172668 (or 11172663 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 18904057812 in words is "eighteen billion, nine hundred four million, fifty-seven thousand, eight hundred twelve".