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_12570759_2 (written_by VARCHAR, us_viewers__millions_ VARCHAR)
### Question:
How many episodes were watched by 12.72 million U.S. viewers?
### Answer:
SELECT COUNT(written_by) FROM table_12570759_2 WHERE us_viewers__millions_ = "12.72"