644302324 has 12 divisors (see below), whose sum is σ = 1139153764. Its totient is φ = 318829824.

The previous prime is 644302283. The next prime is 644302387. The reversal of 644302324 is 423203446.

It can be written as a sum of positive squares in 2 ways, for example, as 249008400 + 395293924 = 15780^2 + 19882^2 .

It is a junction number, because it is equal to n+sod(n) for n = 644302292 and 644302301.

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, 829899 + ... + 830674.

Almost surely, 2^644302324 is an apocalyptic number.

It is an amenable number.

644302324 is a deficient number, since it is larger than the sum of its proper divisors (494851440).

644302324 is a wasteful number, since it uses less digits than its factorization.

644302324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660674 (or 1660672 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

The square root of 644302324 is about 25383.1109992451. The cubic root of 644302324 is about 863.7006225146.

The spelling of 644302324 in words is "six hundred forty-four million, three hundred two thousand, three hundred twenty-four".