138879863280 has 160 divisors (see below), whose sum is σ = 478601421120. Its totient is φ = 37016248320.

The previous prime is 138879863267. The next prime is 138879863341. The reversal of 138879863280 is 82368978831.

138879863280 is a `hidden beast` number, since 1 + 388 + 79 + 86 + 32 + 80 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4652884 + ... + 4682636.

It is an arithmetic number, because the mean of its divisors is an integer number (2991258882).

Almost surely, 2^138879863280 is an apocalyptic number.

138879863280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138879863280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239300710560).

138879863280 is an abundant number, since it is smaller than the sum of its proper divisors (339721557840).

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

138879863280 is a wasteful number, since it uses less digits than its factorization.

138879863280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31936 (or 31924 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 63.

The spelling of 138879863280 in words is "one hundred thirty-eight billion, eight hundred seventy-nine million, eight hundred sixty-three thousand, two hundred eighty".