18384538128 has 80 divisors (see below), whose sum is σ = 51839092800. Its totient is φ = 5568048640.

The previous prime is 18384538087. The next prime is 18384538153. The reversal of 18384538128 is 82183548381.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1084018 + ... + 1100846.

It is an arithmetic number, because the mean of its divisors is an integer number (647988660).

Almost surely, 2^18384538128 is an apocalyptic number.

It is an amenable number.

18384538128 is an abundant number, since it is smaller than the sum of its proper divisors (33454554672).

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

18384538128 is a wasteful number, since it uses less digits than its factorization.

18384538128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18920 (or 18914 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 51.

The spelling of 18384538128 in words is "eighteen billion, three hundred eighty-four million, five hundred thirty-eight thousand, one hundred twenty-eight".