639730332 has 48 divisors (see below), whose sum is σ = 1756127520. Its totient is φ = 200699136.

The previous prime is 639730327. The next prime is 639730367. The reversal of 639730332 is 233037936.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172383 + ... + 176054.

It is an arithmetic number, because the mean of its divisors is an integer number (36585990).

Almost surely, 2^639730332 is an apocalyptic number.

It is an amenable number.

639730332 is an abundant number, since it is smaller than the sum of its proper divisors (1116397188).

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

639730332 is a wasteful number, since it uses less digits than its factorization.

639730332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348467 (or 348459 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 36.

The square root of 639730332 is about 25292.8909379691. The cubic root of 639730332 is about 861.6528210725.

The spelling of 639730332 in words is "six hundred thirty-nine million, seven hundred thirty thousand, three hundred thirty-two".