287285 has 4 divisors (see below), whose sum is σ = 344748. Its totient is φ = 229824.

The previous prime is 287281. The next prime is 287291. The reversal of 287285 is 582782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 158404 + 128881 = 398^2 + 359^2 .

It is a cyclic number.

It is not a de Polignac number, because 287285 - 2² = 287281 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 (287281) 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, 28724 + ... + 28733.

It is an arithmetic number, because the mean of its divisors is an integer number (86187).

2²⁸⁷²⁸⁵ is an apocalyptic number.

It is an amenable number.

287285 is a deficient number, since it is larger than the sum of its proper divisors (57463).

287285 is an equidigital number, since it uses as much as digits as its factorization.

287285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57462.

The product of its digits is 8960, while the sum is 32.

The square root of 287285 is about 535.9897387077. The cubic root of 287285 is about 65.9838497367.

The spelling of 287285 in words is "two hundred eighty-seven thousand, two hundred eighty-five".