Question 71
Mark writes the expression $\sqrt{d}$ for each positive divisor $d$ of $8!$ on the board. Seeing that these expressions might not be worth points on HMMT, Rishabh simplifies each expression to the form $a \sqrt{b}$, where $a$ and $b$ are integers such that $b$ is not divisible by the square of a prime number. (For example, $\sqrt{20}$, $\sqrt{16}$, and $\sqrt{6}$ simplify to $2 \sqrt{5}$, $4 \sqrt{1}$, and $1 \sqrt{6}$, respectively.) Compute the sum of $a+b$ across all expressions that Rishabh writes.