138628876 has 12 divisors (see below), whose sum is σ = 243151272. Its totient is φ = 69157088.

The previous prime is 138628873. The next prime is 138628891. The reversal of 138628876 is 678826831.

138628876 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×138628876² = 38435930522046752, which contains 22 as substring.

138628876 is strictly pandigital in base 9.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37345 + ... + 40888.

It is an arithmetic number, because the mean of its divisors is an integer number (20262606).

Almost surely, 2^138628876 is an apocalyptic number.

It is an amenable number.

138628876 is a deficient number, since it is larger than the sum of its proper divisors (104522396).

138628876 is a wasteful number, since it uses less digits than its factorization.

138628876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78680 (or 78678 counting only the distinct ones).

The product of its digits is 774144, while the sum is 49.

The square root of 138628876 is about 11774.0764393646. The cubic root of 138628876 is about 517.5487142486.

The spelling of 138628876 in words is "one hundred thirty-eight million, six hundred twenty-eight thousand, eight hundred seventy-six".