38938628557 has 6 divisors (see below), whose sum is σ = 41095893678. Its totient is φ = 36889226712.

The previous prime is 38938628551. The next prime is 38938628567. The reversal of 38938628557 is 75582683983.

It can be written as a sum of positive squares in only one way, i.e., 28376750116 + 10561878441 = 168454^2 + 102771^2 .

It is not a de Polignac number, because 38938628557 - 2⁷ = 38938628429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38938628551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53931258 + ... + 53931979.

It is an arithmetic number, because the mean of its divisors is an integer number (6849315613).

Almost surely, 2^38938628557 is an apocalyptic number.

It is an amenable number.

38938628557 is a deficient number, since it is larger than the sum of its proper divisors (2157265121).

38938628557 is a wasteful number, since it uses less digits than its factorization.

38938628557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107863275 (or 107863256 counting only the distinct ones).

The product of its digits is 87091200, while the sum is 64.

The spelling of 38938628557 in words is "thirty-eight billion, nine hundred thirty-eight million, six hundred twenty-eight thousand, five hundred fifty-seven".