18736940872 has 16 divisors (see below), whose sum is σ = 37834207740. Its totient is φ = 8647818816.

The previous prime is 18736940819. The next prime is 18736940891. The reversal of 18736940872 is 27804963781.

It can be written as a sum of positive squares in 2 ways, for example, as 14637612196 + 4099328676 = 120986^2 + 64026^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90081343 + ... + 90081550.

Almost surely, 2^18736940872 is an apocalyptic number.

It is an amenable number.

18736940872 is an abundant number, since it is smaller than the sum of its proper divisors (19097266868).

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

18736940872 is a wasteful number, since it uses less digits than its factorization.

18736940872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180162912 (or 180162908 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 55.

The spelling of 18736940872 in words is "eighteen billion, seven hundred thirty-six million, nine hundred forty thousand, eight hundred seventy-two".