639535272 has 32 divisors (see below), whose sum is σ = 1605895200. Its totient is φ = 212237504.

The previous prime is 639535271. The next prime is 639535277. The reversal of 639535272 is 272535936.

It is a super-2 number, since 2×639535272² = 818010728264227968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (639535271) 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, 53247 + ... + 64142.

It is an arithmetic number, because the mean of its divisors is an integer number (50184225).

Almost surely, 2^639535272 is an apocalyptic number.

It is an amenable number.

639535272 is an abundant number, since it is smaller than the sum of its proper divisors (966359928).

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

639535272 is a wasteful number, since it uses less digits than its factorization.

639535272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117625 (or 117621 counting only the distinct ones).

The product of its digits is 340200, while the sum is 42.

The square root of 639535272 is about 25289.0346197715. The cubic root of 639535272 is about 861.5652367284.

The spelling of 639535272 in words is "six hundred thirty-nine million, five hundred thirty-five thousand, two hundred seventy-two".