Main Page | See live article | Alphabetical index Sixty-eight (68, LXVIII) is a natural number following sixty-seven and preceding sixty-nine. It is a composite number with the divisors being 2, 4, 17 and 34. Its factorization is: Sixty-eight is also: The atomic number of erbium, a lanthanide. 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. This article is about the number 68. For the year AD 68, see 68. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.