644315 has 16 divisors (see below), whose sum is σ = 907200. Its totient is φ = 430080.

The previous prime is 644297. The next prime is 644327. The reversal of 644315 is 513446.

It is a happy number.

It is not a de Polignac number, because 644315 - 2¹² = 640219 is a prime.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1211 + ... + 1659.

It is an arithmetic number, because the mean of its divisors is an integer number (56700).

2⁶⁴⁴³¹⁵ is an apocalyptic number.

644315 is a deficient number, since it is larger than the sum of its proper divisors (262885).

644315 is a wasteful number, since it uses less digits than its factorization.

644315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502.

The product of its digits is 1440, while the sum is 23.

The square root of 644315 is about 802.6923445505. The cubic root of 644315 is about 86.3706286624.

It can be divided in two parts, 644 and 315, that added together give a palindrome (959).

The spelling of 644315 in words is "six hundred forty-four thousand, three hundred fifteen".