644353014 has 8 divisors (see below), whose sum is σ = 1288706040. Its totient is φ = 214784336.

The previous prime is 644353013. The next prime is 644353049. The reversal of 644353014 is 410353446.

644353014 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

644353014 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644353013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53696079 + ... + 53696090.

It is an arithmetic number, because the mean of its divisors is an integer number (161088255).

Almost surely, 2^644353014 is an apocalyptic number.

644353014 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

644353014 is a wasteful number, since it uses less digits than its factorization.

644353014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107392174.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 644353014 is about 25384.1094781755. The cubic root of 644353014 is about 863.7232722526.

The spelling of 644353014 in words is "six hundred forty-four million, three hundred fifty-three thousand, fourteen".