639971334 has 32 divisors (see below), whose sum is σ = 1439303040. Its totient is φ = 210752136.

The previous prime is 639971327. The next prime is 639971359. The reversal of 639971334 is 433179936.

It is a happy number.

639971334 is a `hidden beast` number, since 639 + 9 + 7 + 1 + 3 + 3 + 4 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 639971334.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66912 + ... + 75875.

It is an arithmetic number, because the mean of its divisors is an integer number (44978220).

Almost surely, 2^639971334 is an apocalyptic number.

639971334 is an abundant number, since it is smaller than the sum of its proper divisors (799331706).

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

639971334 is a wasteful number, since it uses less digits than its factorization.

639971334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142881 (or 142875 counting only the distinct ones).

The product of its digits is 367416, while the sum is 45.

The square root of 639971334 is about 25297.6547134314. The cubic root of 639971334 is about 861.7610093571.

The spelling of 639971334 in words is "six hundred thirty-nine million, nine hundred seventy-one thousand, three hundred thirty-four".