320765 has 4 divisors (see below), whose sum is σ = 384924. Its totient is φ = 256608.

The previous prime is 320759. The next prime is 320767. The reversal of 320765 is 567023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 567023 = 617 ⋅919.

It can be written as a sum of positive squares in 2 ways, for example, as 244036 + 76729 = 494^2 + 277^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320765 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320765.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320765.

It is not an unprimeable number, because it can be changed into a prime (320767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32072 + ... + 32081.

It is an arithmetic number, because the mean of its divisors is an integer number (96231).

2³²⁰⁷⁶⁵ is an apocalyptic number.

It is an amenable number.

320765 is a deficient number, since it is larger than the sum of its proper divisors (64159).

320765 is an equidigital number, since it uses as much as digits as its factorization.

320765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64158.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 320765 is about 566.3611921733. The cubic root of 320765 is about 68.4534999739.

Adding to 320765 its reverse (567023), we get a palindrome (887788).

The spelling of 320765 in words is "three hundred twenty thousand, seven hundred sixty-five".