278863 has 8 divisors (see below), whose sum is σ = 316400. Its totient is φ = 243648.

The previous prime is 278849. The next prime is 278867. The reversal of 278863 is 368872.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278863 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 318 + ... + 811.

It is an arithmetic number, because the mean of its divisors is an integer number (39550).

2²⁷⁸⁸⁶³ is an apocalyptic number.

278863 is a deficient number, since it is larger than the sum of its proper divisors (37537).

278863 is a wasteful number, since it uses less digits than its factorization.

278863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161.

The product of its digits is 16128, while the sum is 34.

The square root of 278863 is about 528.0748053070. The cubic root of 278863 is about 65.3326536326.

Subtracting 278863 from its reverse (368872), we obtain a palindrome (90009).

It can be divided in two parts, 27886 and 3, that added together give a square (27889 = 167²).

The spelling of 278863 in words is "two hundred seventy-eight thousand, eight hundred sixty-three".