138416557728 has 24 divisors (see below), whose sum is σ = 363343464288. Its totient is φ = 46138852544.

The previous prime is 138416557687. The next prime is 138416557777. The reversal of 138416557728 is 827755614831.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 720919476 + ... + 720919667.

It is an arithmetic number, because the mean of its divisors is an integer number (15139311012).

Almost surely, 2^138416557728 is an apocalyptic number.

It is an amenable number.

138416557728 is an abundant number, since it is smaller than the sum of its proper divisors (224926906560).

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

138416557728 is a wasteful number, since it uses less digits than its factorization.

138416557728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441839156 (or 1441839148 counting only the distinct ones).

The product of its digits is 11289600, while the sum is 57.

The spelling of 138416557728 in words is "one hundred thirty-eight billion, four hundred sixteen million, five hundred fifty-seven thousand, seven hundred twenty-eight".