639714788 has 12 divisors (see below), whose sum is σ = 1119920172. Its totient is φ = 319737600.

The previous prime is 639714773. The next prime is 639714797. The reversal of 639714788 is 887417936.

It can be written as a sum of positive squares in 2 ways, for example, as 132204004 + 507510784 = 11498^2 + 22528^2 .

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, 17345 + ... + 39752.

It is an arithmetic number, because the mean of its divisors is an integer number (93326681).

Almost surely, 2^639714788 is an apocalyptic number.

It is an amenable number.

639714788 is a deficient number, since it is larger than the sum of its proper divisors (480205384).

639714788 is a wasteful number, since it uses less digits than its factorization.

639714788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59902 (or 59900 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 53.

The square root of 639714788 is about 25292.5836560839. The cubic root of 639714788 is about 861.6458422778.

The spelling of 639714788 in words is "six hundred thirty-nine million, seven hundred fourteen thousand, seven hundred eighty-eight".