320666 has 8 divisors (see below), whose sum is σ = 501984. Its totient is φ = 153340.

The previous prime is 320659. The next prime is 320669. The reversal of 320666 is 666023.

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

It is a Harshad number since it is a multiple of its sum of digits (23).

320666 is a modest number, since divided by 666 gives 320 as remainder.

It is not an unprimeable number, because it can be changed into a prime (320669) by changing a digit.

320666 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, 3440 + ... + 3531.

It is an arithmetic number, because the mean of its divisors is an integer number (62748).

2³²⁰⁶⁶⁶ is an apocalyptic number.

320666 is a deficient number, since it is larger than the sum of its proper divisors (181318).

320666 is a wasteful number, since it uses less digits than its factorization.

320666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6996.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 320666 is about 566.2737853724. The cubic root of 320666 is about 68.4464568179.

Adding to 320666 its reverse (666023), we get a palindrome (986689).

The spelling of 320666 in words is "three hundred twenty thousand, six hundred sixty-six".