138656648 has 32 divisors (see below), whose sum is σ = 280542360. Its totient is φ = 63866880.

The previous prime is 138656647. The next prime is 138656659. The reversal of 138656648 is 846656831.

It can be written as a sum of positive squares in 4 ways, for example, as 130827844 + 7828804 = 11438^2 + 2798^2 .

It is not an unprimeable number, because it can be changed into a prime (138656647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67736 + ... + 69752.

Almost surely, 2^138656648 is an apocalyptic number.

It is an amenable number.

138656648 is an abundant number, since it is smaller than the sum of its proper divisors (141885712).

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

138656648 is a wasteful number, since it uses less digits than its factorization.

138656648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2697 (or 2693 counting only the distinct ones).

The product of its digits is 829440, while the sum is 47.

The square root of 138656648 is about 11775.2557509381. The cubic root of 138656648 is about 517.5832727128.

The spelling of 138656648 in words is "one hundred thirty-eight million, six hundred fifty-six thousand, six hundred forty-eight".