644312360 has 32 divisors (see below), whose sum is σ = 1450431360. Its totient is φ = 257595456.

The previous prime is 644312351. The next prime is 644312419. The reversal of 644312360 is 63213446.

644312360 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 138797 + ... + 143363.

It is an arithmetic number, because the mean of its divisors is an integer number (45325980).

Almost surely, 2^644312360 is an apocalyptic number.

It is an amenable number.

644312360 is an abundant number, since it is smaller than the sum of its proper divisors (806119000).

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

644312360 is a wasteful number, since it uses less digits than its factorization.

644312360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8105 (or 8101 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 644312360 is about 25383.3086889791. The cubic root of 644312360 is about 863.7051069800.

The spelling of 644312360 in words is "six hundred forty-four million, three hundred twelve thousand, three hundred sixty".