644296323 has 12 divisors (see below), whose sum is σ = 944258504. Its totient is φ = 390482400.

The previous prime is 644296319. The next prime is 644296333. The reversal of 644296323 is 323692446.

644296323 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 644296323 - 2² = 644296319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644296333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 887098 + ... + 887823.

Almost surely, 2^644296323 is an apocalyptic number.

644296323 is a deficient number, since it is larger than the sum of its proper divisors (299962181).

644296323 is a wasteful number, since it uses less digits than its factorization.

644296323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774946 (or 1774935 counting only the distinct ones).

The product of its digits is 186624, while the sum is 39.

The square root of 644296323 is about 25382.9927904493. The cubic root of 644296323 is about 863.6979410180.

The spelling of 644296323 in words is "six hundred forty-four million, two hundred ninety-six thousand, three hundred twenty-three".