639504063 has 12 divisors (see below), whose sum is σ = 1007703528. Its totient is φ = 387578160.

The previous prime is 639504007. The next prime is 639504133. The reversal of 639504063 is 360405936.

It is not a de Polignac number, because 639504063 - 2⁹ = 639503551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639509063) 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, 3229720 + ... + 3229917.

It is an arithmetic number, because the mean of its divisors is an integer number (83975294).

Almost surely, 2^639504063 is an apocalyptic number.

639504063 is a deficient number, since it is larger than the sum of its proper divisors (368199465).

639504063 is a wasteful number, since it uses less digits than its factorization.

639504063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6459654 (or 6459651 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The square root of 639504063 is about 25288.4175661507. The cubic root of 639504063 is about 861.5512218501.

Adding to 639504063 its reverse (360405936), we get a palindrome (999909999).

The spelling of 639504063 in words is "six hundred thirty-nine million, five hundred four thousand, sixty-three".