278285 has 8 divisors (see below), whose sum is σ = 381696. Its totient is φ = 190800.

The previous prime is 278279. The next prime is 278321. The reversal of 278285 is 582872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 278285 - 2⁴ = 278269 is a prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3941 + ... + 4010.

It is an arithmetic number, because the mean of its divisors is an integer number (47712).

2²⁷⁸²⁸⁵ is an apocalyptic number.

It is an amenable number.

278285 is a deficient number, since it is larger than the sum of its proper divisors (103411).

278285 is an equidigital number, since it uses as much as digits as its factorization.

278285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7963.

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

The square root of 278285 is about 527.5272504810. The cubic root of 278285 is about 65.2874840286.

It can be divided in two parts, 2 and 78285, that added together give a palindrome (78287).

The spelling of 278285 in words is "two hundred seventy-eight thousand, two hundred eighty-five".