636716648 has 8 divisors (see below), whose sum is σ = 1193843730. Its totient is φ = 318358320.

The previous prime is 636716627. The next prime is 636716651. The reversal of 636716648 is 846617636.

636716648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 406344964 + 230371684 = 20158^2 + 15178^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39794783 + ... + 39794798.

Almost surely, 2^636716648 is an apocalyptic number.

It is an amenable number.

636716648 is a deficient number, since it is larger than the sum of its proper divisors (557127082).

636716648 is a wasteful number, since it uses less digits than its factorization.

636716648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79589587 (or 79589583 counting only the distinct ones).

The product of its digits is 870912, while the sum is 47.

The square root of 636716648 is about 25233.2448963664. The cubic root of 636716648 is about 860.2976471073.

The spelling of 636716648 in words is "six hundred thirty-six million, seven hundred sixteen thousand, six hundred forty-eight".