631648636 has 6 divisors (see below), whose sum is σ = 1105385120. Its totient is φ = 315824316.

The previous prime is 631648627. The next prime is 631648637. The reversal of 631648636 is 636846136.

631648636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 631648592 and 631648601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631648637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78956076 + ... + 78956083.

Almost surely, 2^631648636 is an apocalyptic number.

It is an amenable number.

631648636 is a deficient number, since it is larger than the sum of its proper divisors (473736484).

631648636 is a wasteful number, since it uses less digits than its factorization.

631648636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157912163 (or 157912161 counting only the distinct ones).

The product of its digits is 373248, while the sum is 43.

The square root of 631648636 is about 25132.6209536530. The cubic root of 631648636 is about 858.0090214456.

The spelling of 631648636 in words is "six hundred thirty-one million, six hundred forty-eight thousand, six hundred thirty-six".