138912542928 has 60 divisors (see below), whose sum is σ = 396097343460. Its totient is φ = 45430514688.

The previous prime is 138912542897. The next prime is 138912542957. The reversal of 138912542928 is 829245219831.

138912542928 is a `hidden beast` number, since 1 + 3 + 8 + 9 + 1 + 2 + 542 + 92 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 118892556864 + 20019986064 = 344808^2 + 141492^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9093033 + ... + 9108296.

It is an arithmetic number, because the mean of its divisors is an integer number (6601622391).

Almost surely, 2^138912542928 is an apocalyptic number.

138912542928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138912542928 is an abundant number, since it is smaller than the sum of its proper divisors (257184800532).

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

138912542928 is a wasteful number, since it uses less digits than its factorization.

138912542928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18201396 (or 18201387 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The spelling of 138912542928 in words is "one hundred thirty-eight billion, nine hundred twelve million, five hundred forty-two thousand, nine hundred twenty-eight".