Multipling 817216 by its sum of digits (25), we get a square (20430400 = 45202).
The square root of 817216 is 904.
817216 is nontrivially palindromic in base 15.
It is a Duffinian number.
It is a zygodrome in base 15.
817216 is a Friedman number, since it can be written as (8*(16*7+1))^2, using all its digits and the basic arithmetic operations.
2817216 is an apocalyptic number.
817216 is the 904-th square number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 817216
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
817216 is an equidigital number, since it uses as much as digits as its factorization.
817216 is an odious number, because the sum of its binary digits is odd.
The cubic root of 817216 is about 93.4929694352.
The spelling of 817216 in words is "eight hundred seventeen thousand, two hundred sixteen".