644522304 has 28 divisors (see below), whose sum is σ = 1705299104. Its totient is φ = 214840704.

The previous prime is 644522243. The next prime is 644522321. The reversal of 644522304 is 403225446.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1678252 + ... + 1678635.

Almost surely, 2^644522304 is an apocalyptic number.

644522304 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

644522304 is an abundant number, since it is smaller than the sum of its proper divisors (1060776800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644522304 is a wasteful number, since it uses less digits than its factorization.

644522304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3356902 (or 3356892 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

The square root of 644522304 is about 25387.4438256395. The cubic root of 644522304 is about 863.7989072467.

The spelling of 644522304 in words is "six hundred forty-four million, five hundred twenty-two thousand, three hundred four".