639063557 has 12 divisors (see below), whose sum is σ = 706525260. Its totient is φ = 577589760.

The previous prime is 639063527. The next prime is 639063577. The reversal of 639063557 is 755360936.

It can be written as a sum of positive squares in 2 ways, for example, as 240901441 + 398162116 = 15521^2 + 19954^2 .

It is not a de Polignac number, because 639063557 - 2⁸ = 639063301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639063527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5669 + ... + 36197.

It is an arithmetic number, because the mean of its divisors is an integer number (58877105).

Almost surely, 2^639063557 is an apocalyptic number.

It is an amenable number.

639063557 is a deficient number, since it is larger than the sum of its proper divisors (67461703).

639063557 is a wasteful number, since it uses less digits than its factorization.

639063557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30724 (or 30713 counting only the distinct ones).

The product of its (nonzero) digits is 510300, while the sum is 44.

The square root of 639063557 is about 25279.7064263017. The cubic root of 639063557 is about 861.3533572452.

The spelling of 639063557 in words is "six hundred thirty-nine million, sixty-three thousand, five hundred fifty-seven".