644302624 has 48 divisors (see below), whose sum is σ = 1457870400. Its totient is φ = 274569984.

The previous prime is 644302579. The next prime is 644302627. The reversal of 644302624 is 426203446.

It is not an unprimeable number, because it can be changed into a prime (644302627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32062 + ... + 48130.

It is an arithmetic number, because the mean of its divisors is an integer number (30372300).

Almost surely, 2^644302624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 644302624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (728935200).

644302624 is an abundant number, since it is smaller than the sum of its proper divisors (813567776).

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

644302624 is a wasteful number, since it uses less digits than its factorization.

644302624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16265 (or 16257 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 644302624 is about 25383.1169086856. The cubic root of 644302624 is about 863.7007565666.

The spelling of 644302624 in words is "six hundred forty-four million, three hundred two thousand, six hundred twenty-four".