644324345 has 16 divisors (see below), whose sum is σ = 887323008. Its totient is φ = 439983360.

The previous prime is 644324299. The next prime is 644324377. The reversal of 644324345 is 543423446.

It is not a de Polignac number, because 644324345 - 2⁶ = 644324281 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29759 + ... + 46628.

It is an arithmetic number, because the mean of its divisors is an integer number (55457688).

Almost surely, 2^644324345 is an apocalyptic number.

It is an amenable number.

644324345 is a deficient number, since it is larger than the sum of its proper divisors (242998663).

644324345 is a wasteful number, since it uses less digits than its factorization.

644324345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76640.

The product of its digits is 138240, while the sum is 35.

The square root of 644324345 is about 25383.5447682155. The cubic root of 644324345 is about 863.7104622715.

The spelling of 644324345 in words is "six hundred forty-four million, three hundred twenty-four thousand, three hundred forty-five".