138568680 has 48 divisors (see below), whose sum is σ = 450349380. Its totient is φ = 36951552.

The previous prime is 138568679. The next prime is 138568697. The reversal of 138568680 is 86865831.

138568680 is a `hidden beast` number, since 1 + 3 + 8 + 568 + 6 + 80 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 138156516 + 412164 = 11754^2 + 642^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192097 + ... + 192816.

Almost surely, 2^138568680 is an apocalyptic number.

138568680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138568680 is an abundant number, since it is smaller than the sum of its proper divisors (311780700).

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

138568680 is a wasteful number, since it uses less digits than its factorization.

138568680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384930 (or 384923 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 138568680 is about 11771.5198678845. The cubic root of 138568680 is about 517.4737926937.

The spelling of 138568680 in words is "one hundred thirty-eight million, five hundred sixty-eight thousand, six hundred eighty".