278885 has 12 divisors (see below), whose sum is σ = 357348. Its totient is φ = 208896.

The previous prime is 278881. The next prime is 278891. The reversal of 278885 is 588872.

278885 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in 6 ways, for example, as 2209 + 276676 = 47^2 + 526^2 .

It is not a de Polignac number, because 278885 - 2² = 278881 is a prime.

It is a Duffinian number.

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 278885.

It is not an unprimeable number, because it can be changed into a prime (278881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1349 + ... + 1541.

It is an arithmetic number, because the mean of its divisors is an integer number (29779).

2²⁷⁸⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

278885 is a deficient number, since it is larger than the sum of its proper divisors (78463).

278885 is a wasteful number, since it uses less digits than its factorization.

278885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 215 counting only the distinct ones).

The product of its digits is 35840, while the sum is 38.

The square root of 278885 is about 528.0956352783. The cubic root of 278885 is about 65.3343716573.

It can be divided in two parts, 2 and 78885, that added together give a palindrome (78887).

The spelling of 278885 in words is "two hundred seventy-eight thousand, eight hundred eighty-five".