636800668 has 36 divisors (see below), whose sum is σ = 1297787400. Its totient is φ = 272610912.

The previous prime is 636800653. The next prime is 636800699. The reversal of 636800668 is 866008636.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 325758 + ... + 327706.

It is an arithmetic number, because the mean of its divisors is an integer number (36049650).

Almost surely, 2^636800668 is an apocalyptic number.

It is an amenable number.

636800668 is an abundant number, since it is smaller than the sum of its proper divisors (660986732).

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

636800668 is a wasteful number, since it uses less digits than its factorization.

636800668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3634 (or 3625 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 636800668 is about 25234.9097085763. The cubic root of 636800668 is about 860.3354865603.

The spelling of 636800668 in words is "six hundred thirty-six million, eight hundred thousand, six hundred sixty-eight".