644729312 has 24 divisors (see below), whose sum is σ = 1293263496. Its totient is φ = 316281472.

The previous prime is 644729269. The next prime is 644729317. The reversal of 644729312 is 213927446.

644729312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644729317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188378 + ... + 191769.

It is an arithmetic number, because the mean of its divisors is an integer number (53885979).

Almost surely, 2^644729312 is an apocalyptic number.

It is an amenable number.

644729312 is an abundant number, since it is smaller than the sum of its proper divisors (648534184).

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

644729312 is a wasteful number, since it uses less digits than its factorization.

644729312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380210 (or 380202 counting only the distinct ones).

The product of its digits is 72576, while the sum is 38.

The square root of 644729312 is about 25391.5204743631. The cubic root of 644729312 is about 863.8913758045.

The spelling of 644729312 in words is "six hundred forty-four million, seven hundred twenty-nine thousand, three hundred twelve".