138789680 has 40 divisors (see below), whose sum is σ = 339673200. Its totient is φ = 52593408.

The previous prime is 138789671. The next prime is 138789691. The reversal of 138789680 is 86987831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44135 + ... + 47174.

It is an arithmetic number, because the mean of its divisors is an integer number (8491830).

Almost surely, 2^138789680 is an apocalyptic number.

138789680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138789680 is an abundant number, since it is smaller than the sum of its proper divisors (200883520).

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

138789680 is a wasteful number, since it uses less digits than its factorization.

138789680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91341 (or 91335 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 138789680 is about 11780.9031911819. The cubic root of 138789680 is about 517.7487489209.

The spelling of 138789680 in words is "one hundred thirty-eight million, seven hundred eighty-nine thousand, six hundred eighty".