639135580 has 12 divisors (see below), whose sum is σ = 1342184760. Its totient is φ = 255654224.

The previous prime is 639135529. The next prime is 639135583. The reversal of 639135580 is 85531936.

639135580 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639135583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15978370 + ... + 15978409.

It is an arithmetic number, because the mean of its divisors is an integer number (111848730).

Almost surely, 2^639135580 is an apocalyptic number.

It is an amenable number.

639135580 is an abundant number, since it is smaller than the sum of its proper divisors (703049180).

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

639135580 is a wasteful number, since it uses less digits than its factorization.

639135580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31956788 (or 31956786 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 639135580 is about 25281.1309082485. The cubic root of 639135580 is about 861.3857144454.

The spelling of 639135580 in words is "six hundred thirty-nine million, one hundred thirty-five thousand, five hundred eighty".