639223296 has 80 divisors (see below), whose sum is σ = 1710145008. Its totient is φ = 212172800.

The previous prime is 639223283. The next prime is 639223297. The reversal of 639223296 is 692322936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639223297) 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, 430876 + ... + 432356.

Almost surely, 2^639223296 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639223296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (855072504).

639223296 is an abundant number, since it is smaller than the sum of its proper divisors (1070921712).

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

639223296 is a wasteful number, since it uses less digits than its factorization.

639223296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783 (or 1767 counting only the distinct ones).

The product of its digits is 209952, while the sum is 42.

The square root of 639223296 is about 25282.8656603637. The cubic root of 639223296 is about 861.4251186321.

The spelling of 639223296 in words is "six hundred thirty-nine million, two hundred twenty-three thousand, two hundred ninety-six".