639554682 has 16 divisors (see below), whose sum is σ = 1377502560. Its totient is φ = 196786032.

The previous prime is 639554681. The next prime is 639554701. The reversal of 639554682 is 286455936.

It is a super-2 number, since 2×639554682² = 818060382536242248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (639554681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4099632 + ... + 4099787.

It is an arithmetic number, because the mean of its divisors is an integer number (86093910).

Almost surely, 2^639554682 is an apocalyptic number.

639554682 is an abundant number, since it is smaller than the sum of its proper divisors (737947878).

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

639554682 is a wasteful number, since it uses less digits than its factorization.

639554682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8199437.

The product of its digits is 1555200, while the sum is 48.

The square root of 639554682 is about 25289.4183800261. The cubic root of 639554682 is about 861.5739528554.

The spelling of 639554682 in words is "six hundred thirty-nine million, five hundred fifty-four thousand, six hundred eighty-two".