5. “Xiong Da” $\times$ “Xiong Er” = “Xiong Xiong Di” . If the same Chinese character represents the same digit from 0 to 9, different Chinese characters represent different digits, and “Da” > “Er” , then the sum of all three-digit numbers represented by “Xiong Xiong Di” that satisfy the conditions is $\qquad$ . “Da”+“Er” $<9$;
Enumeration: “Xiong Er” $=10$, younger brother is 0, “Xiong Da” has no value to take. Because different Chinese characters represent different numbers;
“Xiong Er” $=12$, “Xiong Da” can be $13,14,15,16$ (discard, numbers repeat);
“Xiong Er” =13, “Xiong Da” can be 14,15 (discard, numbers repeat);
“Xiong Er” $=14$, “Xiong Da” has no value to take.

So “Xiong Brothers” represents the sum of the three-digit numbers: $12 \times(13+14+15)+13 \times 14=686$