644325 has 36 divisors (see below), whose sum is σ = 1187424. Its totient is φ = 308000.

The previous prime is 644297. The next prime is 644327. The reversal of 644325 is 523446.

It is not a de Polignac number, because 644325 - 2⁶ = 644261 is a prime.

Its product of digits (2880) is a multiple of the sum of its prime divisors (90).

644325 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 644295 and 644304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9040 + ... + 9110.

It is an arithmetic number, because the mean of its divisors is an integer number (32984).

2⁶⁴⁴³²⁵ is an apocalyptic number.

It is an amenable number.

644325 is a deficient number, since it is larger than the sum of its proper divisors (543099).

644325 is a wasteful number, since it uses less digits than its factorization.

644325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106 (or 90 counting only the distinct ones).

The product of its digits is 2880, while the sum is 24.

The square root of 644325 is about 802.6985735630. The cubic root of 644325 is about 86.3710754945.

It can be divided in two parts, 644 and 325, that added together give a palindrome (969).

The spelling of 644325 in words is "six hundred forty-four thousand, three hundred twenty-five".