user: Question: What is the number of rank with the viewership of 5.96 million?
Columns: ['#', 'Episode', 'Air Date', 'Timeslot (EST)', 'Season', 'Rating', 'Share', '18–49', 'Viewers (m)', 'Rank (#)']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'real', 'text', 'text', 'text']
Sample row: [1.0, '" Last Days Of Summer "', 'October 5, 2007', 'Fri. 9:00PM', '2007–2008', '4.2', 7.0, '2.1', '6.48', '#68']
SQL:

assistant: SELECT "Rank (#)" FROM "Table" WHERE "Viewers (m)" = '5.96';