639829572 has 24 divisors (see below), whose sum is σ = 1494190656. Its totient is φ = 213097248.

The previous prime is 639829537. The next prime is 639829573. The reversal of 639829572 is 275928936.

It is not an unprimeable number, because it can be changed into a prime (639829573) 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, 7123 + ... + 36474.

It is an arithmetic number, because the mean of its divisors is an integer number (62257944).

Almost surely, 2^639829572 is an apocalyptic number.

It is an amenable number.

639829572 is an abundant number, since it is smaller than the sum of its proper divisors (854361084).

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

639829572 is a wasteful number, since it uses less digits than its factorization.

639829572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44827 (or 44825 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 51.

The square root of 639829572 is about 25294.8526779659. The cubic root of 639829572 is about 861.6973742227.

The spelling of 639829572 in words is "six hundred thirty-nine million, eight hundred twenty-nine thousand, five hundred seventy-two".