639730334 has 4 divisors (see below), whose sum is σ = 959595504. Its totient is φ = 319865166.

The previous prime is 639730327. The next prime is 639730367. The reversal of 639730334 is 433037936.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159932582 + ... + 159932585.

It is an arithmetic number, because the mean of its divisors is an integer number (239898876).

Almost surely, 2^639730334 is an apocalyptic number.

639730334 is a deficient number, since it is larger than the sum of its proper divisors (319865170).

639730334 is a wasteful number, since it uses less digits than its factorization.

639730334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319865169.

The product of its (nonzero) digits is 122472, while the sum is 38.

The square root of 639730334 is about 25292.8909775059. The cubic root of 639730334 is about 861.6528219704.

The spelling of 639730334 in words is "six hundred thirty-nine million, seven hundred thirty thousand, three hundred thirty-four".