Seventy-five (75, LXXV) is a natural number following seventy-four and preceding seventy-six. It is a composite number with the divisors being 3, 5, 15, and 25. Its factorization is:
- The atomic number of rhenium.
- The designation of Interstate 75, a freeway that runs from Florida to Michigan.
- The denomination of U.S. savings bonds with Adams's portrait.
- The registry of the U.S. Navy's nuclear aircraft carrier USS Harry S Truman (CVN-75), named after U.S. President Harry S Truman.