639080318 has 4 divisors (see below), whose sum is σ = 958620480. Its totient is φ = 319540158.

The previous prime is 639080297. The next prime is 639080327. The reversal of 639080318 is 813080936.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×639080318² = 816847305709962248, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159770078 + ... + 159770081.

It is an arithmetic number, because the mean of its divisors is an integer number (239655120).

Almost surely, 2^639080318 is an apocalyptic number.

639080318 is a deficient number, since it is larger than the sum of its proper divisors (319540162).

639080318 is a wasteful number, since it uses less digits than its factorization.

639080318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319540161.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 639080318 is about 25280.0379350981. The cubic root of 639080318 is about 861.3608875433.

The spelling of 639080318 in words is "six hundred thirty-nine million, eighty thousand, three hundred eighteen".