To divide \( 3639 \sqrt{913} \), it seems you're looking to simplify this expression or perhaps divide it by another number. However, since no number is specified for division in your request, I will explain how to simplify \( 3639 \sqrt{913} \).
Since \( \sqrt{913} \) cannot be simplified further (as 913 is not a perfect square), the expression remains as \( 3639 \sqrt{913} \).
If you want to divide this expression by another number, please specify that number, and I can help you with that calculation.