644420327 has 2 divisors, whose sum is σ = 644420328. Its totient is φ = 644420326.

The previous prime is 644420311. The next prime is 644420347. The reversal of 644420327 is 723024446.

644420327 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 644420327 - 2⁴ = 644420311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 644420293 and 644420302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644420347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322210163 + 322210164.

It is an arithmetic number, because the mean of its divisors is an integer number (322210164).

Almost surely, 2^644420327 is an apocalyptic number.

644420327 is a deficient number, since it is larger than the sum of its proper divisors (1).

644420327 is an equidigital number, since it uses as much as digits as its factorization.

644420327 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 32.

The square root of 644420327 is about 25385.4353320954. The cubic root of 644420327 is about 863.7533477852.

The spelling of 644420327 in words is "six hundred forty-four million, four hundred twenty thousand, three hundred twenty-seven".