639623334 has 64 divisors (see below), whose sum is σ = 1629504000. Its totient is φ = 162943488.

The previous prime is 639623321. The next prime is 639623359. The reversal of 639623334 is 433326936.

639623334 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 639623292 and 639623301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10009 + ... + 37140.

It is an arithmetic number, because the mean of its divisors is an integer number (25461000).

Almost surely, 2^639623334 is an apocalyptic number.

639623334 is an abundant number, since it is smaller than the sum of its proper divisors (989880666).

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

639623334 is a wasteful number, since it uses less digits than its factorization.

639623334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47197.

The product of its digits is 209952, while the sum is 39.

The square root of 639623334 is about 25290.7756701925. The cubic root of 639623334 is about 861.6047798566.

The spelling of 639623334 in words is "six hundred thirty-nine million, six hundred twenty-three thousand, three hundred thirty-four".