636441216 has 32 divisors (see below), whose sum is σ = 1690548000. Its totient is φ = 212146944.

The previous prime is 636441209. The next prime is 636441227. The reversal of 636441216 is 612144636.

It is a tau number, because it is divible by the number of its divisors (32).

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 828316 + ... + 829083.

It is an arithmetic number, because the mean of its divisors is an integer number (52829625).

Almost surely, 2^636441216 is an apocalyptic number.

It is an amenable number.

636441216 is an abundant number, since it is smaller than the sum of its proper divisors (1054106784).

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

636441216 is a wasteful number, since it uses less digits than its factorization.

636441216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1657416 (or 1657404 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 636441216 is about 25227.7865854300. The cubic root of 636441216 is about 860.1735795294.

The spelling of 636441216 in words is "six hundred thirty-six million, four hundred forty-one thousand, two hundred sixteen".