644316794 has 8 divisors (see below), whose sum is σ = 1054336608. Its totient is φ = 292871260.

The previous prime is 644316793. The next prime is 644316817. The reversal of 644316794 is 497613446.

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

It is not an unprimeable number, because it can be changed into a prime (644316793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14643542 + ... + 14643585.

It is an arithmetic number, because the mean of its divisors is an integer number (131792076).

Almost surely, 2^644316794 is an apocalyptic number.

644316794 is a deficient number, since it is larger than the sum of its proper divisors (410019814).

644316794 is a wasteful number, since it uses less digits than its factorization.

644316794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29287140.

The product of its digits is 435456, while the sum is 44.

The square root of 644316794 is about 25383.3960296884. The cubic root of 644316794 is about 863.7070882445.

The spelling of 644316794 in words is "six hundred forty-four million, three hundred sixteen thousand, seven hundred ninety-four".