636748497 has 24 divisors (see below), whose sum is σ = 1146699840. Its totient is φ = 330778080.

The previous prime is 636748493. The next prime is 636748499. The reversal of 636748497 is 794847636.

It is a happy number.

It is not a de Polignac number, because 636748497 - 2² = 636748493 is a prime.

It is not an unprimeable number, because it can be changed into a prime (636748493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 458722 + ... + 460107.

It is an arithmetic number, because the mean of its divisors is an integer number (47779160).

Almost surely, 2^636748497 is an apocalyptic number.

It is an amenable number.

636748497 is a deficient number, since it is larger than the sum of its proper divisors (509951343).

636748497 is a wasteful number, since it uses less digits than its factorization.

636748497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918853 (or 918850 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 54.

The square root of 636748497 is about 25233.8759805148. The cubic root of 636748497 is about 860.3119910927.

The spelling of 636748497 in words is "six hundred thirty-six million, seven hundred forty-eight thousand, four hundred ninety-seven".