138506564 has 12 divisors (see below), whose sum is σ = 277013184. Its totient is φ = 59359944.

The previous prime is 138506527. The next prime is 138506579. The reversal of 138506564 is 465605831.

138506564 is an admirable 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, 2473304 + ... + 2473359.

It is an arithmetic number, because the mean of its divisors is an integer number (23084432).

Almost surely, 2^138506564 is an apocalyptic number.

138506564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138506564 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138506564 is a wasteful number, since it uses less digits than its factorization.

138506564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4946674 (or 4946672 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 138506564 is about 11768.8811702727. The cubic root of 138506564 is about 517.3964587048.

The spelling of 138506564 in words is "one hundred thirty-eight million, five hundred six thousand, five hundred sixty-four".