138628875 has 64 divisors (see below), whose sum is σ = 287659008. Its totient is φ = 57600000.

The previous prime is 138628873. The next prime is 138628891. The reversal of 138628875 is 578826831.

It is not a de Polignac number, because 138628875 - 2¹ = 138628873 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138628873) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26475 + ... + 31275.

It is an arithmetic number, because the mean of its divisors is an integer number (4494672).

Almost surely, 2^138628875 is an apocalyptic number.

138628875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138628875 is an abundant number, since it is smaller than the sum of its proper divisors (149030133).

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

138628875 is a wasteful number, since it uses less digits than its factorization.

138628875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4837 (or 4827 counting only the distinct ones).

The product of its digits is 645120, while the sum is 48.

The square root of 138628875 is about 11774.0763968984. The cubic root of 138628875 is about 517.5487130041.

The spelling of 138628875 in words is "one hundred thirty-eight million, six hundred twenty-eight thousand, eight hundred seventy-five".