18573239128 has 32 divisors (see below), whose sum is σ = 36363052800. Its totient is φ = 8876960928.

The previous prime is 18573239057. The next prime is 18573239129. The reversal of 18573239128 is 82193237581.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18573239129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251203 + ... + 316621.

It is an arithmetic number, because the mean of its divisors is an integer number (1136345400).

Almost surely, 2^18573239128 is an apocalyptic number.

It is an amenable number.

18573239128 is a deficient number, since it is larger than the sum of its proper divisors (17789813672).

18573239128 is a wasteful number, since it uses less digits than its factorization.

18573239128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66991 (or 66987 counting only the distinct ones).

The product of its digits is 725760, while the sum is 49.

The spelling of 18573239128 in words is "eighteen billion, five hundred seventy-three million, two hundred thirty-nine thousand, one hundred twenty-eight".