321644 has 12 divisors (see below), whose sum is σ = 567168. Its totient is φ = 159600.

The previous prime is 321631. The next prime is 321647. The reversal of 321644 is 446123.

321644 = 197² + 198² + ... + 204².

It is a happy number.

321644 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (321647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554 + ... + 974.

It is an arithmetic number, because the mean of its divisors is an integer number (47264).

2³²¹⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

321644 is a deficient number, since it is larger than the sum of its proper divisors (245524).

321644 is a wasteful number, since it uses less digits than its factorization.

321644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616 (or 614 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 321644 is about 567.1366678324. The cubic root of 321644 is about 68.5159711991.

Adding to 321644 its reverse (446123), we get a palindrome (767767).

The spelling of 321644 in words is "three hundred twenty-one thousand, six hundred forty-four".