636040656 has 240 divisors, whose sum is σ = 1974893440. Its totient is φ = 190356480.

The previous prime is 636040589. The next prime is 636040681. The reversal of 636040656 is 656040636.

636040656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 636040656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6175101 + ... + 6175203.

Almost surely, 2^636040656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636040656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (987446720).

636040656 is an abundant number, since it is smaller than the sum of its proper divisors (1338852784).

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

636040656 is a wasteful number, since it uses less digits than its factorization.

636040656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 636040656 is about 25219.8464705874. The cubic root of 636040656 is about 859.9930844946.

The spelling of 636040656 in words is "six hundred thirty-six million, forty thousand, six hundred fifty-six".