644110268 has 12 divisors (see below), whose sum is σ = 1130035032. Its totient is φ = 321243120.

The previous prime is 644110249. The next prime is 644110303. The reversal of 644110268 is 862011446.

It is a congruent 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, 201218 + ... + 204393.

It is an arithmetic number, because the mean of its divisors is an integer number (94169586).

Almost surely, 2^644110268 is an apocalyptic number.

It is an amenable number.

644110268 is a deficient number, since it is larger than the sum of its proper divisors (485924764).

644110268 is a wasteful number, since it uses less digits than its factorization.

644110268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406012 (or 406010 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 644110268 is about 25379.3275718645. The cubic root of 644110268 is about 863.6147956363.

The spelling of 644110268 in words is "six hundred forty-four million, one hundred ten thousand, two hundred sixty-eight".