636644096 has 144 divisors (see below), whose sum is σ = 1488359040. Its totient is φ = 268738560.

The previous prime is 636644087. The next prime is 636644131. The reversal of 636644096 is 690446636.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3905711 + ... + 3905873.

Almost surely, 2^636644096 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 636644096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (744179520).

636644096 is an abundant number, since it is smaller than the sum of its proper divisors (851714944).

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

636644096 is a wasteful number, since it uses less digits than its factorization.

636644096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 44.

The square root of 636644096 is about 25231.8072281793. The cubic root of 636644096 is about 860.2649697324.

The spelling of 636644096 in words is "six hundred thirty-six million, six hundred forty-four thousand, ninety-six".