636888216 has 64 divisors (see below), whose sum is σ = 1681585920. Its totient is φ = 200604800.

The previous prime is 636888191. The next prime is 636888233. The reversal of 636888216 is 612888636.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38866 + ... + 52766.

It is an arithmetic number, because the mean of its divisors is an integer number (26274780).

Almost surely, 2^636888216 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 636888216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (840792960).

636888216 is an abundant number, since it is smaller than the sum of its proper divisors (1044697704).

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

636888216 is a wasteful number, since it uses less digits than its factorization.

636888216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14016 (or 14012 counting only the distinct ones).

The product of its digits is 663552, while the sum is 48.

The square root of 636888216 is about 25236.6443094164. The cubic root of 636888216 is about 860.3749113513.

The spelling of 636888216 in words is "six hundred thirty-six million, eight hundred eighty-eight thousand, two hundred sixteen".