18396688928 has 18 divisors (see below), whose sum is σ = 36219991941. Its totient is φ = 9197960832.

The previous prime is 18396688883. The next prime is 18396688957. The reversal of 18396688928 is 82988669381.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 18314750224 + 81938704 = 135332^2 + 9052^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=95908.

It is a Duffinian number.

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 2 ways as a sum of consecutive naturals, for example, 755276 + ... + 779252.

Almost surely, 2^18396688928 is an apocalyptic number.

It is an amenable number.

18396688928 is a deficient number, since it is larger than the sum of its proper divisors (17823303013).

18396688928 is an frugal number, since it uses more digits than its factorization.

18396688928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47964 (or 23979 counting only the distinct ones).

The product of its digits is 71663616, while the sum is 68.

The spelling of 18396688928 in words is "eighteen billion, three hundred ninety-six million, six hundred eighty-eight thousand, nine hundred twenty-eight".