644452714 has 16 divisors (see below), whose sum is σ = 975774600. Its totient is φ = 319206400.

The previous prime is 644452681. The next prime is 644452723. The reversal of 644452714 is 417254446.

It can be written as a sum of positive squares in 4 ways, for example, as 644296689 + 156025 = 25383^2 + 395^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116802 + ... + 122194.

Almost surely, 2^644452714 is an apocalyptic number.

644452714 is a deficient number, since it is larger than the sum of its proper divisors (331321886).

644452714 is a wasteful number, since it uses less digits than its factorization.

644452714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5945.

The product of its digits is 107520, while the sum is 37.

The square root of 644452714 is about 25386.0732292334. The cubic root of 644452714 is about 863.7678175910.

The spelling of 644452714 in words is "six hundred forty-four million, four hundred fifty-two thousand, seven hundred fourteen".