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Seven hundred twenty is the natural number following 719 and preceding 721. It is 6! (6 factorial), a composite number with thirty divisors, more than any number below, making it a highly composite number. It is a Harshad number in every base from binary to decimal. 720 is expressible as the product of consecutive integers in two different ways: , and . 〔 〕 There are 49 solutions to the equation φ(''x'') = 720, more than any integer below it, making 720 a highly totient number. 720 is a 241-gonal number. ==In other fields== 720 is * A common vertical display resolution for HDTV (see 720i and 720p). * 720 and above is a good credit score. * 720° is two full rotations; the term "720" is a skateboarding trick. * 720° is also the name of a skateboarding video game. * 720 is a dual area code in the Denver Metro Area along with 303. * 720° is the sum of all the defects, of any polyhedron. * 720 is a short form of saying Boeing 720, an airliner that's no longer in service. For the year AD, see 720. 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「720 (number)」の詳細全文を読む スポンサード リンク
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