278886 has 16 divisors (see below), whose sum is σ = 568944. Its totient is φ = 91104.

The previous prime is 278881. The next prime is 278891. The reversal of 278886 is 688872.

It is an interprime number because it is at equal distance from previous prime (278881) and next prime (278891).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278881) by changing a digit.

278886 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 (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121 + ... + 756.

It is an arithmetic number, because the mean of its divisors is an integer number (35559).

2²⁷⁸⁸⁸⁶ is an apocalyptic number.

278886 is an abundant number, since it is smaller than the sum of its proper divisors (290058).

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

278886 is a wasteful number, since it uses less digits than its factorization.

278886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935.

The product of its digits is 43008, while the sum is 39.

The square root of 278886 is about 528.0965820757. The cubic root of 278886 is about 65.3344497472.

The spelling of 278886 in words is "two hundred seventy-eight thousand, eight hundred eighty-six".