644814212 has 12 divisors (see below), whose sum is σ = 1289628480. Its totient is φ = 276348936.

The previous prime is 644814187. The next prime is 644814227. The reversal of 644814212 is 212418446.

644814212 is an admirable number.

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, 11514512 + ... + 11514567.

It is an arithmetic number, because the mean of its divisors is an integer number (107469040).

Almost surely, 2^644814212 is an apocalyptic number.

It is an amenable number.

644814212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

644814212 is a wasteful number, since it uses less digits than its factorization.

644814212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23029090 (or 23029088 counting only the distinct ones).

The product of its digits is 12288, while the sum is 32.

The square root of 644814212 is about 25393.1922372907. The cubic root of 644814212 is about 863.9292941253.

The spelling of 644814212 in words is "six hundred forty-four million, eight hundred fourteen thousand, two hundred twelve".