278856 has 32 divisors (see below), whose sum is σ = 775200. Its totient is φ = 92880.

The previous prime is 278849. The next prime is 278867. The reversal of 278856 is 658872.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a d-powerful number, because it can be written as 2¹⁰ + 7² + 8 + 8⁶ + 5⁶ + 6 .

It is a nialpdrome in base 6.

It is a self number, because there is not a number n which added to its sum of digits gives 278856.

It is an unprimeable number.

278856 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 430 + ... + 861.

It is an arithmetic number, because the mean of its divisors is an integer number (24225).

2²⁷⁸⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

278856 is an abundant number, since it is smaller than the sum of its proper divisors (496344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

278856 is a wasteful number, since it uses less digits than its factorization.

278856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306 (or 1296 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 278856 is about 528.0681774165. The cubic root of 278856 is about 65.3321069694.

The spelling of 278856 in words is "two hundred seventy-eight thousand, eight hundred fifty-six".