Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_24399615_8 (airdate VARCHAR, cable_rank VARCHAR, viewers VARCHAR)
### Question:
When 656000 is the amount of viewers and n/a is the cable rank what is the airdate?
### Answer:
SELECT airdate FROM table_24399615_8 WHERE cable_rank = "N/A" AND viewers = 656000