644482 has 8 divisors (see below), whose sum is σ = 979200. Its totient is φ = 318084.

The previous prime is 644447. The next prime is 644489. The reversal of 644482 is 284446.

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

It is a d-powerful number, because it can be written as 6⁷ + 4⁶ + 4⁸ + 4⁹ + 8⁵ + 2 .

It is a self number, because there is not a number n which added to its sum of digits gives 644482.

It is not an unprimeable number, because it can be changed into a prime (644489) by changing a digit.

644482 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1882 + ... + 2197.

It is an arithmetic number, because the mean of its divisors is an integer number (122400).

2⁶⁴⁴⁴⁸² is an apocalyptic number.

644482 is a deficient number, since it is larger than the sum of its proper divisors (334718).

644482 is a wasteful number, since it uses less digits than its factorization.

644482 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4160.

The product of its digits is 6144, while the sum is 28.

The square root of 644482 is about 802.7963627222. The cubic root of 644482 is about 86.3780901520.

The spelling of 644482 in words is "six hundred forty-four thousand, four hundred eighty-two".