50 (Roman numerals L) is a common year of the Gregorian calendar. It started on a Saturday. It is one of only seven years to use just one Roman numeral. The seven are 1 AD (I), 5 AD (V), 10 AD (X), 50 AD (L), 100 AD (C), 500 AD (D), and 1000 AD (M). Events. The Romans create a city called Londinium on the River ThamesFifty is the integer that is after fortynine and before fiftyone. The prime factors of fifty are 2 and 5. (2 * 5 * 5 = 50) The factors of 50 are 1, 2, 5, 10, 25, and 50. 5*10=50. 50 is the smallest number that can be written as the sum of two squares in two distinct ways 50=1 2 +7 2 =5 2 +5 2. Also, 50 is onehalf of 100 or half of a century (a century is 100 years).
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