644304416 has 48 divisors (see below), whose sum is σ = 1452790080. Its totient is φ = 275539200.

The previous prime is 644304413. The next prime is 644304443. The reversal of 644304416 is 614403446.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (644304413) 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, 111191 + ... + 116841.

It is an arithmetic number, because the mean of its divisors is an integer number (30266460).

Almost surely, 2^644304416 is an apocalyptic number.

It is an amenable number.

644304416 is an abundant number, since it is smaller than the sum of its proper divisors (808485664).

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

644304416 is a wasteful number, since it uses less digits than its factorization.

644304416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6177 (or 6169 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 644304416 is about 25383.1522077145. The cubic root of 644304416 is about 863.7015573034.

The spelling of 644304416 in words is "six hundred forty-four million, three hundred four thousand, four hundred sixteen".