644325734 has 16 divisors (see below), whose sum is σ = 1056371568. Its totient is φ = 292941792.

The previous prime is 644325709. The next prime is 644325751. The reversal of 644325734 is 437523446.

644325734 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183197 + ... + 186680.

It is an arithmetic number, because the mean of its divisors is an integer number (66023223).

Almost surely, 2^644325734 is an apocalyptic number.

644325734 is a deficient number, since it is larger than the sum of its proper divisors (412045834).

644325734 is a wasteful number, since it uses less digits than its factorization.

644325734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369959.

The product of its digits is 241920, while the sum is 38.

The square root of 644325734 is about 25383.5721284456. The cubic root of 644325734 is about 863.7110829180.

The spelling of 644325734 in words is "six hundred forty-four million, three hundred twenty-five thousand, seven hundred thirty-four".