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Number 68

68 is the natural number following 67 and preceding 69. It is a nontotient.

List of numbers — Integers << 60 61 62 63 64 65 66 67 68 69 >>
Cardinal	sixty-eight
Ordinal	68th (sixty-eighth)
Factorization	<math>2^2 \cdot 17<math>
Divisors	2, 4, 17, 34
Roman numeral	LXVIII
Binary	1000100
Hexadecimal	44

Sixty-eight is:

• The atomic number of erbium, a lanthanide.
• In degrees Celsius, the ideal temperature for developing black-and-white film.
• The designation of US Interstate 68, a freeway that runs from West Virginia to Maryland.
• The registry of the U.S. Navy's aircraft carrier USS Nimitz (CVN-68), named after Admiral Chester Nimitz.
• The number of the French department Haut-Rhin.
• The year AD 68, 68 BC, or 1968.