Seventy-two (72, LXXII) is a natural number following seventy-one and preceding seventy-three. It is a composite number with the divisors being 2, 3, 4, 6, 8, 9, 12, 16, 18, 24 and 36. Its factorization is:
Seventy-two is also:
- The atomic number of hafnium.
- The total number of books in the Holy Bible in the Catholic version if the Book of Lamentations is considered part of the Book of Jeremiah.
- The designation of USA Interstate 72, a freeway that runs from Missouri to Illinois.
- The registry of the U.S. Navy's nuclear aircraft carrier USS Abraham Lincoln (CVN-72), named after U.S. President Abraham Lincoln.
- The designation of the Soviet T-72 tank.
- The number of hours in three days.