636468040 has 32 divisors (see below), whose sum is σ = 1542212280. Its totient is φ = 235003392.

The previous prime is 636467989. The next prime is 636468047. The reversal of 636468040 is 40864636.

It can be written as a sum of positive squares in 4 ways, for example, as 220879044 + 415588996 = 14862^2 + 20386^2 .

It is not an unprimeable number, because it can be changed into a prime (636468047) 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, 611469 + ... + 612508.

Almost surely, 2^636468040 is an apocalyptic number.

It is an amenable number.

636468040 is an abundant number, since it is smaller than the sum of its proper divisors (905744240).

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

636468040 is a wasteful number, since it uses less digits than its factorization.

636468040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224001 (or 1223997 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 636468040 is about 25228.3182158463. The cubic root of 636468040 is about 860.1856638986.

The spelling of 636468040 in words is "six hundred thirty-six million, four hundred sixty-eight thousand, forty".