320785 has 4 divisors (see below), whose sum is σ = 384948. Its totient is φ = 256624.

The previous prime is 320767. The next prime is 320791. The reversal of 320785 is 587023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 587023 = 157 ⋅3739.

It can be written as a sum of positive squares in 2 ways, for example, as 219024 + 101761 = 468^2 + 319^2 .

It is a cyclic number.

It is not a de Polignac number, because 320785 - 2⁷ = 320657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32074 + ... + 32083.

It is an arithmetic number, because the mean of its divisors is an integer number (96237).

2³²⁰⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

320785 is a deficient number, since it is larger than the sum of its proper divisors (64163).

320785 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 9 representation: 320785 = (538027)₉.

320785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64162.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 320785 is about 566.3788484751. The cubic root of 320785 is about 68.4549226577.

The spelling of 320785 in words is "three hundred twenty thousand, seven hundred eighty-five".