278438255 has 16 divisors (see below), whose sum is σ = 352894080. Its totient is φ = 210317472.

The previous prime is 278438243. The next prime is 278438261. The reversal of 278438255 is 552834872.

It is a cyclic number.

It is not a de Polignac number, because 278438255 - 2¹⁰ = 278437231 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24392 + ... + 33938.

It is an arithmetic number, because the mean of its divisors is an integer number (22055880).

Almost surely, 2^278438255 is an apocalyptic number.

278438255 is a deficient number, since it is larger than the sum of its proper divisors (74455825).

278438255 is a wasteful number, since it uses less digits than its factorization.

278438255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9878.

The product of its digits is 537600, while the sum is 44.

The square root of 278438255 is about 16686.4692191008. The cubic root of 278438255 is about 652.9946670484.

The spelling of 278438255 in words is "two hundred seventy-eight million, four hundred thirty-eight thousand, two hundred fifty-five".