636043064 has 16 divisors (see below), whose sum is σ = 1192951800. Its totient is φ = 317922592.

The previous prime is 636043033. The next prime is 636043091. The reversal of 636043064 is 460340636.

It is a self number, because there is not a number n which added to its sum of digits gives 636043064.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 19907 + ... + 40845.

Almost surely, 2^636043064 is an apocalyptic number.

It is an amenable number.

636043064 is a deficient number, since it is larger than the sum of its proper divisors (556908736).

636043064 is a wasteful number, since it uses less digits than its factorization.

636043064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24742 (or 24738 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 32.

The square root of 636043064 is about 25219.8942107218. The cubic root of 636043064 is about 859.9941697820.

The spelling of 636043064 in words is "six hundred thirty-six million, forty-three thousand, sixty-four".