138488628 has 24 divisors (see below), whose sum is σ = 326773440. Its totient is φ = 45643840.

The previous prime is 138488599. The next prime is 138488639. The reversal of 138488628 is 826884831.

138488628 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63768 + ... + 65903.

It is an arithmetic number, because the mean of its divisors is an integer number (13615560).

Almost surely, 2^138488628 is an apocalyptic number.

It is an amenable number.

138488628 is an abundant number, since it is smaller than the sum of its proper divisors (188284812).

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

138488628 is a wasteful number, since it uses less digits than its factorization.

138488628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129767 (or 129765 counting only the distinct ones).

The product of its digits is 589824, while the sum is 48.

The square root of 138488628 is about 11768.1191360387. The cubic root of 138488628 is about 517.3741242074.

The spelling of 138488628 in words is "one hundred thirty-eight million, four hundred eighty-eight thousand, six hundred twenty-eight".