638728616170 has 16 divisors (see below), whose sum is σ = 1151394847200. Its totient is φ = 255117371344.

The previous prime is 638728616161. The next prime is 638728616219. The reversal of 638728616170 is 71616827836.

638728616170 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×638728616170² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46752220 + ... + 46765879.

It is an arithmetic number, because the mean of its divisors is an integer number (71962177950).

Almost surely, 2^638728616170 is an apocalyptic number.

638728616170 is a deficient number, since it is larger than the sum of its proper divisors (512666231030).

638728616170 is a wasteful number, since it uses less digits than its factorization.

638728616170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93518789.

The product of its (nonzero) digits is 4064256, while the sum is 55.

The spelling of 638728616170 in words is "six hundred thirty-eight billion, seven hundred twenty-eight million, six hundred sixteen thousand, one hundred seventy".