Use the five numbers 2, 3, 4, 5, and 6 to form a three-digit number and a two-digit number. If the product of the three-digit number and the two-digit number is to be as large as possible, then the formed three-digit number is How many.
用2、3、4、5、6这五个数字组成一个三位数和一个两位数，如果要使这个三位数与这个两位数的乘积尽量大，那么所组成的三位数是多少．
<result>542</result>