It is a happy number.
It is a nialpdrome in base 16.
It is a congruent number.
256784 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 56784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90768).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
56784 is a wasteful number, since it uses less digits than its factorization.
56784 is an odious number, because the sum of its binary digits is odd.
The square root of 56784 is about 238.2939361377. The cubic root of 56784 is about 38.4363371318.
Adding to 56784 its product of digits (6720), we get a square (63504 = 2522).
The spelling of 56784 in words is "fifty-six thousand, seven hundred eighty-four".