6. Three consecutive even numbers, the average of which can be divided by three different prime numbers, the smallest number among these three even numbers is the smallest when it is $\qquad$ _.

翻译完成，保留了原文的格式和换行。
【Analysis】The average of three consecutive even numbers is the middle number.  
When the smallest number is at its minimum, the middle number is also at its minimum. If the middle number can be divided by 3 different prime numbers, then the smallest it can be is $2 \times 3 \times 5=30$. Therefore, the smallest number is 28.