639108807 has 8 divisors (see below), whose sum is σ = 875176176. Its totient is φ = 414556992.

The previous prime is 639108793. The next prime is 639108817. The reversal of 639108807 is 708801936.

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

It is not a de Polignac number, because 639108807 - 2⁸ = 639108551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639108817) 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, 2878758 + ... + 2878979.

It is an arithmetic number, because the mean of its divisors is an integer number (109397022).

Almost surely, 2^639108807 is an apocalyptic number.

639108807 is a deficient number, since it is larger than the sum of its proper divisors (236067369).

639108807 is a wasteful number, since it uses less digits than its factorization.

639108807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5757777.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 639108807 is about 25280.6013971187. The cubic root of 639108807 is about 861.3736866366.

The spelling of 639108807 in words is "six hundred thirty-nine million, one hundred eight thousand, eight hundred seven".