138788864 has 60 divisors (see below), whose sum is σ = 285466104. Its totient is φ = 67436544.

The previous prime is 138788849. The next prime is 138788873. The reversal of 138788864 is 468887831.

It is a happy number.

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, 704414 + ... + 704610.

Almost surely, 2^138788864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138788864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142733052).

138788864 is an abundant number, since it is smaller than the sum of its proper divisors (146677240).

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

138788864 is an frugal number, since it uses more digits than its factorization.

138788864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 242 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 53.

The square root of 138788864 is about 11780.8685588118. The cubic root of 138788864 is about 517.7477342350.

The spelling of 138788864 in words is "one hundred thirty-eight million, seven hundred eighty-eight thousand, eight hundred sixty-four".