639372272 has 80 divisors (see below), whose sum is σ = 1594374144. Its totient is φ = 241056000.

The previous prime is 639372259. The next prime is 639372317. The reversal of 639372272 is 272273936.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29822 + ... + 46562.

Almost surely, 2^639372272 is an apocalyptic number.

639372272 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639372272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (797187072).

639372272 is an abundant number, since it is smaller than the sum of its proper divisors (955001872).

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

639372272 is a wasteful number, since it uses less digits than its factorization.

639372272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16798 (or 16792 counting only the distinct ones).

The product of its digits is 190512, while the sum is 41.

The square root of 639372272 is about 25285.8116737430. The cubic root of 639372272 is about 861.4920340595.

The spelling of 639372272 in words is "six hundred thirty-nine million, three hundred seventy-two thousand, two hundred seventy-two".