278785255 has 16 divisors (see below), whose sum is σ = 390139200. Its totient is φ = 191165856.

The previous prime is 278785253. The next prime is 278785289. The reversal of 278785255 is 552587872.

It is not a de Polignac number, because 278785255 - 2¹ = 278785253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a junction number, because it is equal to n+sod(n) for n = 278785199 and 278785208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278785253) 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 in 15 ways as a sum of consecutive naturals, for example, 79564 + ... + 82993.

It is an arithmetic number, because the mean of its divisors is an integer number (24383700).

Almost surely, 2^278785255 is an apocalyptic number.

278785255 is a deficient number, since it is larger than the sum of its proper divisors (111353945).

278785255 is an equidigital number, since it uses as much as digits as its factorization.

278785255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162583 (or 162569 counting only the distinct ones).

The product of its digits is 1568000, while the sum is 49.

The square root of 278785255 is about 16696.8636276398. The cubic root of 278785255 is about 653.2658164356.

It can be divided in two parts, 27878 and 5255, that added together give a palindrome (33133).

The spelling of 278785255 in words is "two hundred seventy-eight million, seven hundred eighty-five thousand, two hundred fifty-five".