644325774 has 16 divisors (see below), whose sum is σ = 1300056912. Its totient is φ = 212874368.

The previous prime is 644325751. The next prime is 644325779. The reversal of 644325774 is 477523446.

644325774 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644325779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474489 + ... + 475844.

It is an arithmetic number, because the mean of its divisors is an integer number (81253557).

Almost surely, 2^644325774 is an apocalyptic number.

644325774 is an abundant number, since it is smaller than the sum of its proper divisors (655731138).

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

644325774 is a wasteful number, since it uses less digits than its factorization.

644325774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950451.

The product of its digits is 564480, while the sum is 42.

The square root of 644325774 is about 25383.5729163568. The cubic root of 644325774 is about 863.7111007912.

The spelling of 644325774 in words is "six hundred forty-four million, three hundred twenty-five thousand, seven hundred seventy-four".