We found that some numbers have an interesting feature, for example, 6 has four factors 1, 2, 3, 6, besides 6 itself, there are three factors of 1, 2, 3. 6=1+2+3, exactly the sum of all factors (except itself). So how many of the following numbers have the same characteristics
我们发现一些数具有一个有趣的特点，例如，6有四个因数1、2、3、6，除6本身以外，还有1、2、3三个因数．6=1+2+3，恰好是所有因数(本身除外)之和．那么下面的数中也具有同样特点的是多少
<gadget id="calculator">1 + 2 + 4 + 7 + 14</gadget>
<output>28</output>

<result>28</result>