138878368764 has 12 divisors (see below), whose sum is σ = 324049527144. Its totient is φ = 46292789584.

The previous prime is 138878368747. The next prime is 138878368771. The reversal of 138878368764 is 467863878831.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5786598687 + ... + 5786598710.

It is an arithmetic number, because the mean of its divisors is an integer number (27004127262).

Almost surely, 2^138878368764 is an apocalyptic number.

It is an amenable number.

138878368764 is an abundant number, since it is smaller than the sum of its proper divisors (185171158380).

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

138878368764 is a wasteful number, since it uses less digits than its factorization.

138878368764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11573197404 (or 11573197402 counting only the distinct ones).

The product of its digits is 260112384, while the sum is 69.

The spelling of 138878368764 in words is "one hundred thirty-eight billion, eight hundred seventy-eight million, three hundred sixty-eight thousand, seven hundred sixty-four".