The Big Bang Theory2007

Sheldon Cooper:
What is the best number? By the way, there's only one correct answer.

Raj Koothrappali:
Five million, three hundred eighteen thousand and eight?

Sheldon Cooper:
Wrong. The best number is 73. You're probably wondering why.

Howard Wolowitz:
No.

Raj Koothrappali:
We're good.

Sheldon Cooper:
73 is the 21st prime number. Its mirror, 37, is the 12th, and its mirror, 21, is the product of multiplying - hang on to your hats - seven and three. Heh? Heh? Did I lie?

Leonard Hofstadter:
We get it. 73 is the Chuck Norris of numbers.

Sheldon Cooper:
Chuck Norris wishes. In binary, 73 is a palindrome: 1001001, which backwards is 1001001. Exactly the same. All Chuck Norris backwards gets you is "sirron kcuhc."

Raj Koothrappali:
Just for the record, when you enter 5,318,008 in a calculator, upside down, it spells "boobies."