278871 has 4 divisors (see below), whose sum is σ = 371832. Its totient is φ = 185912.

The previous prime is 278867. The next prime is 278879. The reversal of 278871 is 178872.

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

It is a cyclic number.

It is not a de Polignac number, because 278871 - 2² = 278867 is a prime.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 278871.

It is not an unprimeable number, because it can be changed into a prime (278879) 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, 46476 + ... + 46481.

It is an arithmetic number, because the mean of its divisors is an integer number (92958).

2²⁷⁸⁸⁷¹ is an apocalyptic number.

278871 is a deficient number, since it is larger than the sum of its proper divisors (92961).

278871 is an equidigital number, since it uses as much as digits as its factorization.

278871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92960.

The product of its digits is 6272, while the sum is 33.

The square root of 278871 is about 528.0823799371. The cubic root of 278871 is about 65.3332783793. Note that the first 3 decimals are identical.

Subtracting from 278871 its reverse (178872), we obtain a palindrome (99999).

The spelling of 278871 in words is "two hundred seventy-eight thousand, eight hundred seventy-one".