644230 has 16 divisors (see below), whose sum is σ = 1210464. Its totient is φ = 246400.

The previous prime is 644227. The next prime is 644239. The reversal of 644230 is 32446.

It is a junction number, because it is equal to n+sod(n) for n = 644198 and 644207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1171 + ... + 1630.

It is an arithmetic number, because the mean of its divisors is an integer number (75654).

2⁶⁴⁴²³⁰ is an apocalyptic number.

644230 is a deficient number, since it is larger than the sum of its proper divisors (566234).

644230 is a wasteful number, since it uses less digits than its factorization.

644230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2831.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 644230 is about 802.6393959930. The cubic root of 644230 is about 86.3668304032.

Adding to 644230 its reverse (32446), we get a palindrome (676676).

The spelling of 644230 in words is "six hundred forty-four thousand, two hundred thirty".