636745968 has 40 divisors (see below), whose sum is σ = 1827698000. Its totient is φ = 212248512.

The previous prime is 636745943. The next prime is 636745969. The reversal of 636745968 is 869547636.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636745969) 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, 736543 + ... + 737406.

It is an arithmetic number, because the mean of its divisors is an integer number (45692450).

Almost surely, 2^636745968 is an apocalyptic number.

It is an amenable number.

636745968 is an abundant number, since it is smaller than the sum of its proper divisors (1190952032).

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

636745968 is a wasteful number, since it uses less digits than its factorization.

636745968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473966 (or 1473954 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The square root of 636745968 is about 25233.8258692573. The cubic root of 636745968 is about 860.3108521124.

The spelling of 636745968 in words is "six hundred thirty-six million, seven hundred forty-five thousand, nine hundred sixty-eight".