639564107 has 12 divisors (see below), whose sum is σ = 791482320. Its totient is φ = 506027808.

The previous prime is 639564103. The next prime is 639564127. The reversal of 639564107 is 701465936.

It is not a de Polignac number, because 639564107 - 2² = 639564103 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639564103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 269132 + ... + 271497.

It is an arithmetic number, because the mean of its divisors is an integer number (65956860).

Almost surely, 2^639564107 is an apocalyptic number.

639564107 is a deficient number, since it is larger than the sum of its proper divisors (151918213).

639564107 is a wasteful number, since it uses less digits than its factorization.

639564107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540662 (or 540649 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 639564107 is about 25289.6047220988. The cubic root of 639564107 is about 861.5781851204.

The spelling of 639564107 in words is "six hundred thirty-nine million, five hundred sixty-four thousand, one hundred seven".