636216812 has 24 divisors (see below), whose sum is σ = 1388110080. Its totient is φ = 247876560.

The previous prime is 636216701. The next prime is 636216821. The reversal of 636216812 is 218612636.

It is a super-3 number, since 3×636216812³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1032512 + ... + 1033127.

It is an arithmetic number, because the mean of its divisors is an integer number (57837920).

Almost surely, 2^636216812 is an apocalyptic number.

It is an amenable number.

636216812 is an abundant number, since it is smaller than the sum of its proper divisors (751893268).

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

636216812 is a wasteful number, since it uses less digits than its factorization.

636216812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2065661 (or 2065659 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 636216812 is about 25223.3386370639. The cubic root of 636216812 is about 860.0724709074.

The spelling of 636216812 in words is "six hundred thirty-six million, two hundred sixteen thousand, eight hundred twelve".