639822404 has 48 divisors (see below), whose sum is σ = 1289328768. Its totient is φ = 275194368.

The previous prime is 639822401. The next prime is 639822437. The reversal of 639822404 is 404228936.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (639822401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87539 + ... + 94565.

It is an arithmetic number, because the mean of its divisors is an integer number (26861016).

Almost surely, 2^639822404 is an apocalyptic number.

It is an amenable number.

639822404 is an abundant number, since it is smaller than the sum of its proper divisors (649506364).

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

639822404 is a wasteful number, since it uses less digits than its factorization.

639822404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7164 (or 7162 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 639822404 is about 25294.7109886632. The cubic root of 639822404 is about 861.6941563502.

The spelling of 639822404 in words is "six hundred thirty-nine million, eight hundred twenty-two thousand, four hundred four".