636790656 has 32 divisors (see below), whose sum is σ = 1691476200. Its totient is φ = 212263424.

The previous prime is 636790621. The next prime is 636790663. The reversal of 636790656 is 656097636.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 828771 + ... + 829538.

Almost surely, 2^636790656 is an apocalyptic number.

It is an amenable number.

636790656 is an abundant number, since it is smaller than the sum of its proper divisors (1054685544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

636790656 is a wasteful number, since it uses less digits than its factorization.

636790656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658326 (or 1658314 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 48.

The square root of 636790656 is about 25234.7113318144. The cubic root of 636790656 is about 860.3309777062.

The spelling of 636790656 in words is "six hundred thirty-six million, seven hundred ninety thousand, six hundred fifty-six".