138607578 has 16 divisors (see below), whose sum is σ = 308016960. Its totient is φ = 46202508.

The previous prime is 138607577. The next prime is 138607583. The reversal of 138607578 is 875706831.

138607578 is a `hidden beast` number, since 1 + 38 + 607 + 5 + 7 + 8 = 666.

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 not an unprimeable number, because it can be changed into a prime (138607577) 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, 1283350 + ... + 1283457.

It is an arithmetic number, because the mean of its divisors is an integer number (19251060).

Almost surely, 2^138607578 is an apocalyptic number.

138607578 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138607578 is an abundant number, since it is smaller than the sum of its proper divisors (169409382).

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

138607578 is a wasteful number, since it uses less digits than its factorization.

138607578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566818 (or 2566812 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The square root of 138607578 is about 11773.1719600115. The cubic root of 138607578 is about 517.5222086667.

The spelling of 138607578 in words is "one hundred thirty-eight million, six hundred seven thousand, five hundred seventy-eight".