• 256 can be written using four 4's:
The square root of 256 is 16.
It is a Jordan-Polya number, since it can be written as (2!)8.
256 is nontrivially palindromic in base 15.
256 is an esthetic number in base 15, because in such base its adjacent digits differ by 1.
It is an alternating number because its digits alternate between even and odd.
It is a Duffinian number.
256 is an undulating number in base 15.
It is a plaindrome in base 10, base 13 and base 14.
It is a nialpdrome in base 2, base 4, base 8 and base 16.
In principle, a polygon with 256 sides can be constructed with ruler and compass.
It is an impolite number, since it cannot be written as a nontrivial sum of consecutive naturals.
256 is the 16-th square number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 256
256 is an frugal number, since it uses more digits than its factorization.
256 is an odious number, because the sum of its binary digits is odd.
The cubic root of 256 is about 6.3496042079.
Subtracting from 256 its sum of digits (13), we obtain a 5-th power (243 = 35).
Subtracting from 256 its product of digits (60), we obtain a square (196 = 142).
The spelling of 256 in words is "two hundred fifty-six", and thus it is an aban number.