636564340 has 12 divisors (see below), whose sum is σ = 1336785156. Its totient is φ = 254625728.

The previous prime is 636564329. The next prime is 636564349. The reversal of 636564340 is 43465636.

It can be written as a sum of positive squares in 2 ways, for example, as 125171344 + 511392996 = 11188^2 + 22614^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 636564340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636564349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15914089 + ... + 15914128.

It is an arithmetic number, because the mean of its divisors is an integer number (111398763).

Almost surely, 2^636564340 is an apocalyptic number.

It is an amenable number.

636564340 is an abundant number, since it is smaller than the sum of its proper divisors (700220816).

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

636564340 is a wasteful number, since it uses less digits than its factorization.

636564340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31828226 (or 31828224 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 37.

The square root of 636564340 is about 25230.2267132105. The cubic root of 636564340 is about 860.2290448158.

The spelling of 636564340 in words is "six hundred thirty-six million, five hundred sixty-four thousand, three hundred forty".