18939628512 has 72 divisors (see below), whose sum is σ = 61553799216. Its totient is φ = 5411321856.

The previous prime is 18939628489. The next prime is 18939628517. The reversal of 18939628512 is 21582693981.

18939628512 is a `hidden beast` number, since 1 + 8 + 9 + 3 + 9 + 628 + 5 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-3 number, since 3×18939628512³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18939628517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4695313 + ... + 4699344.

It is an arithmetic number, because the mean of its divisors is an integer number (854913878).

Almost surely, 2^18939628512 is an apocalyptic number.

18939628512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18939628512 is an abundant number, since it is smaller than the sum of its proper divisors (42614170704).

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

18939628512 is a wasteful number, since it uses less digits than its factorization.

18939628512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9394680 (or 9394669 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The spelling of 18939628512 in words is "eighteen billion, nine hundred thirty-nine million, six hundred twenty-eight thousand, five hundred twelve".