278289 has 16 divisors (see below), whose sum is σ = 450240. Its totient is φ = 168480.

The previous prime is 278279. The next prime is 278321. The reversal of 278289 is 982872.

It is not a de Polignac number, because 278289 - 2¹³ = 270097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (278209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172 + ... + 765.

It is an arithmetic number, because the mean of its divisors is an integer number (28140).

2²⁷⁸²⁸⁹ is an apocalyptic number.

It is an amenable number.

278289 is a deficient number, since it is larger than the sum of its proper divisors (171951).

278289 is a wasteful number, since it uses less digits than its factorization.

278289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957 (or 951 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 278289 is about 527.5310417407. The cubic root of 278289 is about 65.2877968358.

The spelling of 278289 in words is "two hundred seventy-eight thousand, two hundred eighty-nine".