644359 has 2 divisors, whose sum is σ = 644360. Its totient is φ = 644358.

The previous prime is 644353. The next prime is 644363. The reversal of 644359 is 953446.

644359 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 644359 - 2⁵ = 644327 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 6⁴ + 4⁷ + 3¹² + 4⁷ + 5⁷ + 9³ .

It is a self number, because there is not a number n which added to its sum of digits gives 644359.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322179 + 322180.

It is an arithmetic number, because the mean of its divisors is an integer number (322180).

2⁶⁴⁴³⁵⁹ is an apocalyptic number.

644359 is a deficient number, since it is larger than the sum of its proper divisors (1).

644359 is an equidigital number, since it uses as much as digits as its factorization.

644359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The square root of 644359 is about 802.7197518437. The cubic root of 644359 is about 86.3725946890.

The spelling of 644359 in words is "six hundred forty-four thousand, three hundred fifty-nine".