57 (number)

57 was a number.

Jack Harkness outlined a "basic fifty-seven fifty-six strategy" to cover all exits on the ground floor to prevent Blon Fel-Fotch Passameer-Day Slitheen from escaping. (TV: Boom Town)

In an attempt to pass Jackie Tyler off as her daughter Rose Tyler to Yvonne Hartman, the Tenth Doctor claimed that she had aged 57 years after looking into the Time Vortex. Jackie, however, insisted that her age was 40. (TV: Doomsday)

When William Shakespeare indicated a desire to flirt with the Tenth Doctor, the Doctor stated that "fifty-seven academics just punched the air". (TV: The Shakespeare Code)

The Tenth Doctor claimed to be passenger 57 to a Heavenly Host on Max Capricorn's Titanic. (TV: Voyage of the Damned)

When the Twelfth Doctor asked Clara Oswald to pick a two-digit number, she chose 57. He then asked the crew of the crew to look at the first word of page 57 of the book they were holding, as part of the Helman-Ziegler test. (TV: Last Christmas)

In an alternate timeline where River Song refused to kill the Eleventh Doctor on 22 April 2011 at 5:02, the time kept alternating between 57 and 58 seconds past the minute. (TV: The Wedding of River Song)

When the Nestene Consciousness' part of the normal universe was caught in the edge of the Last Great Time War, the Maternity Reefs were crushed by 57 duplicates of the planet Earth. (PROSE: Revenge of the Nestene)

Behind the scenes
In the cinema introduction to The Day of the Doctor, the Eleventh Doctor claimed that "all 57 Doctors" would appear in the 100th anniversary special of Doctor Who in 2063.

According to Steven Moffat, Russell T Davies had a tendency to use 57 when exaggerated a number. Moffat numbered Floor 0507 as a tribute to Davies.