320646 has 8 divisors (see below), whose sum is σ = 641304. Its totient is φ = 106880.

The previous prime is 320627. The next prime is 320647. The reversal of 320646 is 646023.

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

320646 is an admirable number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320646.

It is not an unprimeable number, because it can be changed into a prime (320647) by changing a digit.

320646 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, 26715 + ... + 26726.

It is an arithmetic number, because the mean of its divisors is an integer number (80163).

2³²⁰⁶⁴⁶ is an apocalyptic number.

320646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

320646 is a wasteful number, since it uses less digits than its factorization.

320646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53446.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 320646 is about 566.2561257947. The cubic root of 320646 is about 68.4450337821.

Adding to 320646 its reverse (646023), we get a palindrome (966669).

The spelling of 320646 in words is "three hundred twenty thousand, six hundred forty-six".