The number that is also a whole number in the given set of rational numbers is 0, since it is an integer.
A whole number is any number without fractions or decimal parts. Looking at the set of rational numbers {0, 9/10, -0.32, -17}, we see that the number 0 does not have any fractions or decimal parts. Therefore, 0 is the number in the set that is also a whole number.
