18194959728 has 90 divisors (see below), whose sum is σ = 55970648552. Its totient is φ = 5513618880.

The previous prime is 18194959723. The next prime is 18194959729. The reversal of 18194959728 is 82795949181.

18194959728 is a `hidden beast` number, since 1 + 8 + 19 + 4 + 9 + 597 + 28 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18194959723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 504700 + ... + 539547.

Almost surely, 2^18194959728 is an apocalyptic number.

18194959728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18194959728 is an abundant number, since it is smaller than the sum of its proper divisors (37775688824).

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

18194959728 is a wasteful number, since it uses less digits than its factorization.

18194959728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044283 (or 1044263 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 63.

The spelling of 18194959728 in words is "eighteen billion, one hundred ninety-four million, nine hundred fifty-nine thousand, seven hundred twenty-eight".