644464334 has 8 divisors (see below), whose sum is σ = 969436080. Its totient is φ = 321318976.

The previous prime is 644464333. The next prime is 644464351. The reversal of 644464334 is 433464446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644464333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455714 + ... + 457125.

It is an arithmetic number, because the mean of its divisors is an integer number (121179510).

Almost surely, 2^644464334 is an apocalyptic number.

644464334 is a deficient number, since it is larger than the sum of its proper divisors (324971746).

644464334 is a wasteful number, since it uses less digits than its factorization.

644464334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913194.

The product of its digits is 331776, while the sum is 38.

The square root of 644464334 is about 25386.3020938458. The cubic root of 644464334 is about 863.7730090356.

The spelling of 644464334 in words is "six hundred forty-four million, four hundred sixty-four thousand, three hundred thirty-four".