320642 has 16 divisors (see below), whose sum is σ = 565440. Its totient is φ = 133488.

The previous prime is 320627. The next prime is 320647. The reversal of 320642 is 246023.

It is a super-2 number, since 2×320642² = 205622584328, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 320642.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320642.

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

320642 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209 + ... + 827.

It is an arithmetic number, because the mean of its divisors is an integer number (35340).

2³²⁰⁶⁴² is an apocalyptic number.

320642 is a deficient number, since it is larger than the sum of its proper divisors (244798).

320642 is a wasteful number, since it uses less digits than its factorization.

320642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 320642 is about 566.2525938130. The cubic root of 320642 is about 68.4447491678. Note that the first 3 decimals are identical.

Adding to 320642 its reverse (246023), we get a palindrome (566665).

The spelling of 320642 in words is "three hundred twenty thousand, six hundred forty-two".