638985792174 has 32 divisors (see below), whose sum is σ = 1280670289920. Its totient is φ = 212545944000.

The previous prime is 638985792139. The next prime is 638985792187. The reversal of 638985792174 is 471297589836.

It is a junction number, because it is equal to n+sod(n) for n = 638985792099 and 638985792108.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5543722 + ... + 5657810.

It is an arithmetic number, because the mean of its divisors is an integer number (40020946560).

Almost surely, 2^638985792174 is an apocalyptic number.

638985792174 is an abundant number, since it is smaller than the sum of its proper divisors (641684497746).

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

638985792174 is a wasteful number, since it uses less digits than its factorization.

638985792174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116056.

The product of its digits is 182891520, while the sum is 69.

The spelling of 638985792174 in words is "six hundred thirty-eight billion, nine hundred eighty-five million, seven hundred ninety-two thousand, one hundred seventy-four".