320684 has 24 divisors (see below), whose sum is σ = 691488. Its totient is φ = 126720.

The previous prime is 320669. The next prime is 320687. The reversal of 320684 is 486023.

320684 = T₂₀₇ + T₂₀₈ + ... + T₂₂₀.

It is a happy number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320684.

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

320684 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 7 ways as a sum of consecutive naturals, for example, 77 + ... + 804.

It is an arithmetic number, because the mean of its divisors is an integer number (28812).

2³²⁰⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

320684 is an abundant number, since it is smaller than the sum of its proper divisors (370804).

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

320684 is a wasteful number, since it uses less digits than its factorization.

320684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905 (or 903 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 320684 is about 566.2896785215. The cubic root of 320684 is about 68.4477374995.

The spelling of 320684 in words is "three hundred twenty thousand, six hundred eighty-four".