639292216 has 16 divisors (see below), whose sum is σ = 1231070040. Its totient is φ = 311006880.

The previous prime is 639292207. The next prime is 639292217. The reversal of 639292216 is 612292936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639292217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1079590 + ... + 1080181.

Almost surely, 2^639292216 is an apocalyptic number.

It is an amenable number.

639292216 is a deficient number, since it is larger than the sum of its proper divisors (591777824).

639292216 is a wasteful number, since it uses less digits than its factorization.

639292216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159814 (or 2159810 counting only the distinct ones).

The product of its digits is 69984, while the sum is 40.

The square root of 639292216 is about 25284.2286020357. The cubic root of 639292216 is about 861.4560766640.

The spelling of 639292216 in words is "six hundred thirty-nine million, two hundred ninety-two thousand, two hundred sixteen".