644343465 has 8 divisors (see below), whose sum is σ = 1030949568. Its totient is φ = 343649840.

The previous prime is 644343457. The next prime is 644343473. The reversal of 644343465 is 564343446.

It is an interprime number because it is at equal distance from previous prime (644343457) and next prime (644343473).

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

It is not a de Polignac number, because 644343465 - 2³ = 644343457 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21478101 + ... + 21478130.

It is an arithmetic number, because the mean of its divisors is an integer number (128868696).

Almost surely, 2^644343465 is an apocalyptic number.

It is an amenable number.

644343465 is a deficient number, since it is larger than the sum of its proper divisors (386606103).

644343465 is a wasteful number, since it uses less digits than its factorization.

644343465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42956239.

The product of its digits is 414720, while the sum is 39.

The square root of 644343465 is about 25383.9213873665. The cubic root of 644343465 is about 863.7190055778.

The spelling of 644343465 in words is "six hundred forty-four million, three hundred forty-three thousand, four hundred sixty-five".