639318312 has 64 divisors (see below), whose sum is σ = 1782648000. Its totient is φ = 212294592.

The previous prime is 639318283. The next prime is 639318313. The reversal of 639318312 is 213813936.

639318312 is a `hidden beast` number, since 639 + 3 + 1 + 8 + 3 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (639318313) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 52603 + ... + 63605.

It is an arithmetic number, because the mean of its divisors is an integer number (27853875).

Almost surely, 2^639318312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639318312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (891324000).

639318312 is an abundant number, since it is smaller than the sum of its proper divisors (1143329688).

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

639318312 is a wasteful number, since it uses less digits than its factorization.

639318312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11287 (or 11277 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 639318312 is about 25284.7446496895. The cubic root of 639318312 is about 861.4677980914.

The spelling of 639318312 in words is "six hundred thirty-nine million, three hundred eighteen thousand, three hundred twelve".