There is a natural number with 10 different divisors, but the prime divisors are only 2 and 3. So, what is the largest natural number?
有一个自然数含有10个不同的约数，但质约数只有2和3．那么，这个自然数最大是多少．
<gadget id="calculator">3 ** 4</gadget>
<output>81</output>

<gadget id="calculator">2 * 81</gadget>
<output>162</output>

<result>162</result>