639479714 has 16 divisors (see below), whose sum is σ = 976451640. Its totient is φ = 314012160.

The previous prime is 639479699. The next prime is 639479759. The reversal of 639479714 is 417974936.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 138839089 + 500640625 = 11783^2 + 22375^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82802 + ... + 90194.

Almost surely, 2^639479714 is an apocalyptic number.

639479714 is a deficient number, since it is larger than the sum of its proper divisors (336971926).

639479714 is a wasteful number, since it uses less digits than its factorization.

639479714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8165.

The product of its digits is 1143072, while the sum is 50.

The square root of 639479714 is about 25287.9361356359. The cubic root of 639479714 is about 861.5402872431.

The spelling of 639479714 in words is "six hundred thirty-nine million, four hundred seventy-nine thousand, seven hundred fourteen".