278912 has 16 divisors (see below), whose sum is σ = 555900. Its totient is φ = 139392.

The previous prime is 278911. The next prime is 278917. The reversal of 278912 is 219872.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

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 polite number, since it can be written as a sum of consecutive naturals, namely, 962 + ... + 1217.

278912 is a Friedman number, since it can be written as (8-2)^7-2^(9+1), using all its digits and the basic arithmetic operations.

2²⁷⁸⁹¹² is an apocalyptic number.

It is an amenable number.

278912 is a deficient number, since it is larger than the sum of its proper divisors (276988).

278912 is an equidigital number, since it uses as much as digits as its factorization.

278912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193 (or 2181 counting only the distinct ones).

The product of its digits is 2016, while the sum is 29.

The square root of 278912 is about 528.1211982112. The cubic root of 278912 is about 65.3364800187.

The spelling of 278912 in words is "two hundred seventy-eight thousand, nine hundred twelve".