644450327 has 2 divisors, whose sum is σ = 644450328. Its totient is φ = 644450326.

The previous prime is 644450311. The next prime is 644450347. The reversal of 644450327 is 723054446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 644450327 - 2⁴ = 644450311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644450347) 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 as a sum of consecutive naturals, namely, 322225163 + 322225164.

It is an arithmetic number, because the mean of its divisors is an integer number (322225164).

Almost surely, 2^644450327 is an apocalyptic number.

644450327 is a deficient number, since it is larger than the sum of its proper divisors (1).

644450327 is an equidigital number, since it uses as much as digits as its factorization.

644450327 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 35.

The square root of 644450327 is about 25386.0262152232. The cubic root of 644450327 is about 863.7667511480.

The spelling of 644450327 in words is "six hundred forty-four million, four hundred fifty thousand, three hundred twenty-seven".