Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Week | Date | Opponent | Result | Game site | Attendance |
| --- | --- | --- | --- | --- | --- |
| 1.0 | 1973-09-17 | at Green Bay Packers | L 23–7 | Milwaukee County Stadium | 47124.0 |
| 2.0 | 1973-09-23 | at Baltimore Colts | W 34–10 | Memorial Stadium | 55942.0 |
| 3.0 | 1973-09-30 | at Buffalo Bills | L 9–7 | Rich Stadium | 77425.0 |
| 4.0 | 1973-10-07 | at Miami Dolphins | L 31–3 | Miami Orange Bowl | 63850.0 |
| 5.0 | 1973-10-14 | at New England Patriots | W 9–7 | Schafer Stadium | 58659.0 |
| 6.0 | 1973-10-21 | at Pittsburgh Steelers | L 26–14 | Three Rivers Stadium | 48682.0 |
| 7.0 | 1973-10-28 | Denver Broncos | L 40–28 | Shea Stadium | 55108.0 |
| 8.0 | 1973-11-04 | Miami Dolphins | L 24–14 | Shea Stadium | 57791.0 |
| 9.0 | 1973-11-11 | New England Patriots | W 33–13 | Shea Stadium | 51034.0 |
| 10.0 | 1973-11-18 | at Cincinnati Bengals | L 20–14 | Riverfront Stadium | 55745.0 |
| 11.0 | 1973-11-25 | Atlanta Falcons | L 28–20 | Shea Stadium | 47283.0 |
| 12.0 | 1973-12-02 | Baltimore Colts | W 20–17 | Shea Stadium | 51167.0 |
| 13.0 | 1973-12-09 | at Philadelphia Eagles | L 24–23 | Veterans Stadium | 34621.0 |
| 14.0 | 1973-12-16 | Buffalo Bills | L 34–14 | Shea Stadium | 47740.0 |
Question:
What's the Lowest Attendance with a Game site of Riverfront Stadium?
Answer:
55745.0