639573106 has 8 divisors (see below), whose sum is σ = 959529564. Its totient is φ = 319729920.

The previous prime is 639573097. The next prime is 639573149. The reversal of 639573106 is 601375936.

639573106 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 636300625 + 3272481 = 25225^2 + 1809^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12415 + ... + 37858.

Almost surely, 2^639573106 is an apocalyptic number.

639573106 is a deficient number, since it is larger than the sum of its proper divisors (319956458).

639573106 is a wasteful number, since it uses less digits than its factorization.

639573106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56636.

The product of its (nonzero) digits is 102060, while the sum is 40.

The square root of 639573106 is about 25289.7826404262. The cubic root of 639573106 is about 861.5822260527.

The spelling of 639573106 in words is "six hundred thirty-nine million, five hundred seventy-three thousand, one hundred six".