320287 has 6 divisors (see below), whose sum is σ = 352184. Its totient is φ = 291060.

The previous prime is 320273. The next prime is 320291. The reversal of 320287 is 782023.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-320287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1203 + ... + 1444.

2³²⁰²⁸⁷ is an apocalyptic number.

320287 is a deficient number, since it is larger than the sum of its proper divisors (31897).

320287 is a wasteful number, since it uses less digits than its factorization.

320287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2669 (or 2658 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 320287 is about 565.9390426539. The cubic root of 320287 is about 68.4194802192.

The spelling of 320287 in words is "three hundred twenty thousand, two hundred eighty-seven".