138628887056 has 40 divisors (see below), whose sum is σ = 297137999808. Its totient is φ = 62125616000.

The previous prime is 138628887053. The next prime is 138628887071. The reversal of 138628887056 is 650788826831.

It is a self number, because there is not a number n which added to its sum of digits gives 138628887056.

It is not an unprimeable number, because it can be changed into a prime (138628887053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5534435 + ... + 5559426.

Almost surely, 2^138628887056 is an apocalyptic number.

138628887056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138628887056 is an abundant number, since it is smaller than the sum of its proper divisors (158509112752).

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

138628887056 is a wasteful number, since it uses less digits than its factorization.

138628887056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11093951 (or 11093945 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 62.

The spelling of 138628887056 in words is "one hundred thirty-eight billion, six hundred twenty-eight million, eight hundred eighty-seven thousand, fifty-six".