639107072 has 80 divisors (see below), whose sum is σ = 1358953200. Its totient is φ = 299892736.

The previous prime is 639107071. The next prime is 639107087. The reversal of 639107072 is 270701936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639107071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12058598 + ... + 12058650.

It is an arithmetic number, because the mean of its divisors is an integer number (16986915).

Almost surely, 2^639107072 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 639107072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (679476600).

639107072 is an abundant number, since it is smaller than the sum of its proper divisors (719846128).

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

639107072 is an frugal number, since it uses more digits than its factorization.

639107072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 639107072 is about 25280.5670822472. The cubic root of 639107072 is about 861.3729071737.

The spelling of 639107072 in words is "six hundred thirty-nine million, one hundred seven thousand, seventy-two".