644294339 has 16 divisors (see below), whose sum is σ = 735648480. Its totient is φ = 559004160.

The previous prime is 644294323. The next prime is 644294369. The reversal of 644294339 is 933492446.

644294339 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 644294339 - 2⁴ = 644294323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 644294339.

It is not an unprimeable number, because it can be changed into a prime (644294309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223769 + ... + 226629.

It is an arithmetic number, because the mean of its divisors is an integer number (45978030).

Almost surely, 2^644294339 is an apocalyptic number.

644294339 is a deficient number, since it is larger than the sum of its proper divisors (91354141).

644294339 is a wasteful number, since it uses less digits than its factorization.

644294339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3910.

The product of its digits is 559872, while the sum is 44.

The square root of 644294339 is about 25382.9537091332. The cubic root of 644294339 is about 863.6970544805.

The spelling of 644294339 in words is "six hundred forty-four million, two hundred ninety-four thousand, three hundred thirty-nine".