The sum of two natural numbers is 54, what is the largest product of these two natural numbers?
两个自然数的和是54，那么这两个自然数的乘积最大是多少？
<gadget id="calculator">54 / 2</gadget>
<output>27</output>

<gadget id="calculator">27 * 27</gadget>
<output>729</output>

<result>729</result>