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73 is the natural number following 72 and preceding 74.

1 In mathematics

Seventy-three is the 21st prime number. The previous is seventy-one, with which it comprises a twin prime. It is also a permutable prime with thirty-seven. 73 is a star numberA star number or centered 12-gonal number is a figurate number that represents a centered hexagram, such as the one that Chinese checkers are played on. The star numbers for n is given by the formula 6''n ''n 1) + 1. The first few star numbers are 1, 13,.

Every positive integer is the sum of at most 73 sixth powers.

2 In other fields

Seventy-three is also:

• The atomic numberThe atomic number Z is a term used in chemistry and physics to represent the number of protons found in the nucleus of an atom. In an atom of neutral charge, the number of electrons typically equals the atomic number. The atomic number originally meant th of tantalumfor the article on Transactional Analysis (TA) see Transactional analysis Tantalum (formerly tantalium is a chemical element in the periodic table that has the symbol Ta and atomic number 73. A rare, hard, blue-gray, lustrous, transition metal, tantalum i.
• The total number of books in the Holy Bible in the CatholicGeneral meaning Catholic means universal or whole''. With respect to the Christian Church, the early Christians used the term to refer to the whole undivided church. It is in that sense that all Christians today claim ownership of the term, including Prot version if the Book of Lamentations is counted as a book separate from the Book of Jeremiah.
• The designation of USAThe United States of America also referred to as the United States U. America ¹ or the States is a federal republic in central North America, stretching from the Atlantic in the east to the Pacific Ocean in the west. It shares land borders with Canada in Interstate 73Interstate 73 is an intrastate interstate highway located entirely within the state of North Carolina. Its southern terminus is at Candor, North Carolina at an intersection with U. Highway 220; its northern terminus is at Greensboro, North Carolina at an, a freeway in North CarolinaNorth Carolina is a southern state in the United States. North Carolina is one of the thirteen colonies that revolted against British rule in the American Revolution. It is bordered by South Carolina on the south, Georgia on the southwest, Tennessee on th.
• The registry of the U.S. Navy's nuclear aircraft carrier USS George Washington (CVN-73), named after U.S. President George Washington.
• In baseball, the single-season home run record set by Barry Bonds in 2001.
• The year AD 73, 73 BC, or 1973.
• Ham radio operators often use the number 73 as a way of saying aloha. This is because in morse code it forms a palindrome --... ...-- which has a very distinctive sound.