There are two three-digit numbers whose six numbers are different. It is known that the sum of these two three-digit numbers is equal to 1771. What is the maximum value of the product of these two three-digit numbers?
有两个三位数，构成它们的六个数字互不相同，已知这两个三位数的和等于1771，求这两个三位数的积最大值是多少？
<gadget id="calculator">904 * 867</gadget>
<output>783_768</output>

<result>783_768</result>