278867863 has 2 divisors, whose sum is σ = 278867864. Its totient is φ = 278867862.

The previous prime is 278867843. The next prime is 278867891. The reversal of 278867863 is 368768872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278867863 - 2¹⁷ = 278736791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278867803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139433931 + 139433932.

It is an arithmetic number, because the mean of its divisors is an integer number (139433932).

Almost surely, 2^278867863 is an apocalyptic number.

278867863 is a deficient number, since it is larger than the sum of its proper divisors (1).

278867863 is an equidigital number, since it uses as much as digits as its factorization.

278867863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5419008, while the sum is 55.

The square root of 278867863 is about 16699.3372024161. The cubic root of 278867863 is about 653.3303340195.

The spelling of 278867863 in words is "two hundred seventy-eight million, eight hundred sixty-seven thousand, eight hundred sixty-three".