644332315 has 8 divisors (see below), whose sum is σ = 843489648. Its totient is φ = 468605280.

The previous prime is 644332301. The next prime is 644332361. The reversal of 644332315 is 513233446.

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

It is not a de Polignac number, because 644332315 - 2⁹ = 644331803 is a prime.

It is a Duffinian 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, 5857512 + ... + 5857621.

It is an arithmetic number, because the mean of its divisors is an integer number (105436206).

Almost surely, 2^644332315 is an apocalyptic number.

644332315 is a deficient number, since it is larger than the sum of its proper divisors (199157333).

644332315 is a wasteful number, since it uses less digits than its factorization.

644332315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11715149.

The product of its digits is 25920, while the sum is 31.

The square root of 644332315 is about 25383.7017591997. The cubic root of 644332315 is about 863.7140234924.

The spelling of 644332315 in words is "six hundred forty-four million, three hundred thirty-two thousand, three hundred fifteen".