278868 has 24 divisors (see below), whose sum is σ = 689472. Its totient is φ = 87424.

The previous prime is 278867. The next prime is 278879. The reversal of 278868 is 868872.

It is a super-2 number, since 2×278868² = 155534722848, which contains 22 as substring.

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 278868.

It is not an unprimeable number, because it can be changed into a prime (278867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480 + ... + 887.

It is an arithmetic number, because the mean of its divisors is an integer number (28728).

2²⁷⁸⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

278868 is an abundant number, since it is smaller than the sum of its proper divisors (410604).

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

278868 is a wasteful number, since it uses less digits than its factorization.

278868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391 (or 1389 counting only the distinct ones).

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

The square root of 278868 is about 528.0795394635. The cubic root of 278868 is about 65.3330441007. Note that the first 3 decimals are identical.

The spelling of 278868 in words is "two hundred seventy-eight thousand, eight hundred sixty-eight".