Seventy-Three is a natural number that follows seventy-two and precedes seventy-four. It is an odd number and can be expressed in Roman numerals as LXXIII. In mathematics, seventy-three is classified as a prime number, meaning it has no divisors other than one and itself. This property makes it significant in number theory. In popular culture, the number seventy-three has gained recognition through various references, including its mention in the television series The Big Bang Theory. In the show, the character Sheldon Cooper highlights seventy-three as his favorite number, citing its unique mathematical properties and significance.