Main Page | See live article | Alphabetical index For the year A.D. 36, see 36. Thirty-six (36, XXXVI) is the natural number following thirty-five and preceeding thirty-seven. It is the square of 6 as well as a triangular number. Its divisors are 1, 2, 3, 4, 6, 9, 12, 18 and 36, making it a highly composite number; its factorisation is This number is the sum of a twin prime (17 + 19). Thirty-six is also: The atomic number of krypton. On the piano, the total amount of black keys (for notes not on the C major scale). The code for direct dial international phone calls to Hungary. List of numbers Thirty-four - Thirty-five - Thirty-six - Thirty-seven - Thirty-eight Integer This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.