-280 is an even number.
-280 is a Harshad number, which means it is divisible by the sum of its digits (2 + 8 + 0 = 10, and -280 is divisible by 10).
In binary, -280 is represented as 1111111111111111111111111111111111111111111111111111111011101000.
In hex, -280 is represented as fffffffffffffee8.