639167120 has 20 divisors (see below), whose sum is σ = 1486063740. Its totient is φ = 255666816.

The previous prime is 639167101. The next prime is 639167153. The reversal of 639167120 is 21761936.

It can be written as a sum of positive squares in 2 ways, for example, as 308072704 + 331094416 = 17552^2 + 18196^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3994715 + ... + 3994874.

It is an arithmetic number, because the mean of its divisors is an integer number (74303187).

Almost surely, 2^639167120 is an apocalyptic number.

It is an amenable number.

639167120 is an abundant number, since it is smaller than the sum of its proper divisors (846896620).

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

639167120 is a wasteful number, since it uses less digits than its factorization.

639167120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7989602 (or 7989596 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 639167120 is about 25281.7546859390. The cubic root of 639167120 is about 861.3998834050.

The spelling of 639167120 in words is "six hundred thirty-nine million, one hundred sixty-seven thousand, one hundred twenty".