138877628 has 12 divisors (see below), whose sum is σ = 244309632. Its totient is φ = 69074880.

The previous prime is 138877597. The next prime is 138877637. The reversal of 138877628 is 826778831.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90125 + ... + 91652.

It is an arithmetic number, because the mean of its divisors is an integer number (20359136).

Almost surely, 2^138877628 is an apocalyptic number.

It is an amenable number.

138877628 is a deficient number, since it is larger than the sum of its proper divisors (105432004).

138877628 is a wasteful number, since it uses less digits than its factorization.

138877628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181972 (or 181970 counting only the distinct ones).

The product of its digits is 903168, while the sum is 50.

The square root of 138877628 is about 11784.6352510377. The cubic root of 138877628 is about 517.8580878674.

The spelling of 138877628 in words is "one hundred thirty-eight million, eight hundred seventy-seven thousand, six hundred twenty-eight".