The product of 4 one-digit numbers is 360, and only one of them is a composite number, so what is the largest one among the four-digit numbers composed of these 4 numbers?
4个一位数的乘积是360，并且其中只有一个是合数，那么在这4个数字所组成的四位数中，最大的一个是多少．
<result>8_533</result>