320689 has 8 divisors (see below), whose sum is σ = 340992. Its totient is φ = 300960.

The previous prime is 320687. The next prime is 320693. The reversal of 320689 is 986023.

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

It is a cyclic number.

It is not a de Polignac number, because 320689 - 2¹ = 320687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1584 + ... + 1774.

It is an arithmetic number, because the mean of its divisors is an integer number (42624).

2³²⁰⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

320689 is a deficient number, since it is larger than the sum of its proper divisors (20303).

320689 is a wasteful number, since it uses less digits than its factorization.

320689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 320689 is about 566.2940932060. The cubic root of 320689 is about 68.4480932359.

The spelling of 320689 in words is "three hundred twenty thousand, six hundred eighty-nine".