138663678 has 8 divisors (see below), whose sum is σ = 277327368. Its totient is φ = 46221224.

The previous prime is 138663667. The next prime is 138663683. The reversal of 138663678 is 876366831.

It is a sphenic number, since it is the product of 3 distinct primes.

138663678 is an admirable number.

It is a super-3 number, since 3×138663678³ (a number of 25 digits) contains 333 as substring.

It is a congruent 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, 11555301 + ... + 11555312.

It is an arithmetic number, because the mean of its divisors is an integer number (34665921).

Almost surely, 2^138663678 is an apocalyptic number.

138663678 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.

138663678 is a wasteful number, since it uses less digits than its factorization.

138663678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23110618.

The product of its digits is 870912, while the sum is 48.

The square root of 138663678 is about 11775.5542544714. The cubic root of 138663678 is about 517.5920198566.

The spelling of 138663678 in words is "one hundred thirty-eight million, six hundred sixty-three thousand, six hundred seventy-eight".