639510742 has 16 divisors (see below), whose sum is σ = 1034101152. Its totient is φ = 294860160.

The previous prime is 639510727. The next prime is 639510761. The reversal of 639510742 is 247015936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14878 + ... + 38734.

It is an arithmetic number, because the mean of its divisors is an integer number (64631322).

Almost surely, 2^639510742 is an apocalyptic number.

639510742 is a deficient number, since it is larger than the sum of its proper divisors (394590410).

639510742 is a wasteful number, since it uses less digits than its factorization.

639510742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24903.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 639510742 is about 25288.5496223093. The cubic root of 639510742 is about 861.5542211955.

The spelling of 639510742 in words is "six hundred thirty-nine million, five hundred ten thousand, seven hundred forty-two".