636564664 has 32 divisors (see below), whose sum is σ = 1239984000. Its totient is φ = 306034560.

The previous prime is 636564659. The next prime is 636564667. The reversal of 636564664 is 466465636.

636564664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636564667) 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, 30762 + ... + 47110.

It is an arithmetic number, because the mean of its divisors is an integer number (38749500).

Almost surely, 2^636564664 is an apocalyptic number.

It is an amenable number.

636564664 is a deficient number, since it is larger than the sum of its proper divisors (603419336).

636564664 is a wasteful number, since it uses less digits than its factorization.

636564664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16543 (or 16539 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 46.

The square root of 636564664 is about 25230.2331340794. The cubic root of 636564664 is about 860.2291907629.

The spelling of 636564664 in words is "six hundred thirty-six million, five hundred sixty-four thousand, six hundred sixty-four".