56 (fifty-six) is the natural number following 55 and preceding 57. 56 is: The sum of the first six triangular numbers (making it a tetrahedral number). [1] The number of ways to choose 3 out of 8 objects or 5 out of 8 objects, if order does not matter. a tetranacci number [2] and as a multiple of 7 and 8, a pronic number. [3] . More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.