639316168 has 16 divisors (see below), whose sum is σ = 1199137500.
Its totient is φ = 319546176.
The previous prime is 639316133. The next prime is 639316187. The reversal of 639316168 is 861613936.
It can be written as a sum of positive squares in 2 ways, for example, as 607031044 + 32285124 = 24638^2 + 5682^2
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, 13458 + ... + 38206.
Almost surely, 2639316168 is an apocalyptic number.
It is an amenable number.
639316168 is a deficient number, since it is larger than the sum of its proper divisors (559821332).
639316168 is a wasteful number, since it uses less digits than its factorization.
639316168 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 27984 (or 27980 counting only the distinct ones).
The product of its digits is 139968, while the sum is 43.
The square root of 639316168 is about 25284.7022525479.
The cubic root of 639316168 is about 861.4668350922.
The spelling of 639316168 in words is "six hundred thirty-nine million, three hundred sixteen thousand, one hundred sixty-eight".