278916 has 24 divisors (see below), whose sum is σ = 710304. Its totient is φ = 84480.

The previous prime is 278911. The next prime is 278917. The reversal of 278916 is 619872.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278911) by changing a digit.

It is a nontrivial repunit in base 65.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 925 + ... + 1188.

It is an arithmetic number, because the mean of its divisors is an integer number (29596).

2²⁷⁸⁹¹⁶ is an apocalyptic number.

It is an amenable number.

278916 is an abundant number, since it is smaller than the sum of its proper divisors (431388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

278916 is a wasteful number, since it uses less digits than its factorization.

278916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131 (or 2129 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 278916 is about 528.1249852071. The cubic root of 278916 is about 65.3367923570.

The spelling of 278916 in words is "two hundred seventy-eight thousand, nine hundred sixteen".