639170120 has 16 divisors (see below), whose sum is σ = 1438132860. Its totient is φ = 255668032.

The previous prime is 639170099. The next prime is 639170137. The reversal of 639170120 is 21071936.

It can be written as a sum of positive squares in 2 ways, for example, as 575904004 + 63266116 = 23998^2 + 7954^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7989587 + ... + 7989666.

Almost surely, 2^639170120 is an apocalyptic number.

It is an amenable number.

639170120 is an abundant number, since it is smaller than the sum of its proper divisors (798962740).

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

639170120 is a wasteful number, since it uses less digits than its factorization.

639170120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15979264 (or 15979260 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 639170120 is about 25281.8140171943. The cubic root of 639170120 is about 861.4012310940.

The spelling of 639170120 in words is "six hundred thirty-nine million, one hundred seventy thousand, one hundred twenty".