138208507228 has 36 divisors (see below), whose sum is σ = 265918290120. Its totient is φ = 62806263520.

The previous prime is 138208507211. The next prime is 138208507231. The reversal of 138208507228 is 822705802831.

138208507228 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2013075 + ... + 2080597.

It is an arithmetic number, because the mean of its divisors is an integer number (7386619170).

Almost surely, 2^138208507228 is an apocalyptic number.

It is an amenable number.

138208507228 is a deficient number, since it is larger than the sum of its proper divisors (127709782892).

138208507228 is a wasteful number, since it uses less digits than its factorization.

138208507228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71778 (or 71765 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 46.

The spelling of 138208507228 in words is "one hundred thirty-eight billion, two hundred eight million, five hundred seven thousand, two hundred twenty-eight".