72 目录 在数学 在科学 在其它领域中 参考文献 导航菜单Royal Society of Chemistry - Visual Element Periodic Table

整数


7173自然数






















数表 — 整数


<<
70
71
72
73
74
75
76
77
78
79
>>



小写七十二
大写柒拾贰
质因数分解
23×32displaystyle 2^3times 3^2
罗马数字LXXII
二进制1001000
八进制110
十二进制60
十六进制48

72是71与73之间的自然数。




目录





  • 1 在数学


  • 2 在科学


  • 3 在其它领域中


  • 4 参考文献




在数学


  • 第51個合數，正因數有1、2、3、4、6、8、9、12、18、24、36和72。前一個為70、下一個為74。

    質因數分解為23×32displaystyle 2^3times 3^2。

  • 第15個過剩數，真因數和為123，盈度為51。前一個為70、下一個為78。
    • 第16個半完全數，和為本身的其中一組因數為1、 2、 4、 6、 8、 9、 18、 24。前一個為66、下一個為78。

  • 第9個普洛尼克數，為8與9的乘積。前一個為56、下一個為90。

  • 第28個十进制的哈沙德數。前一個為70、下一個為80。

  • 第40個十进制的奢侈數。前一個為70、下一個為74。


  • 六維的吻數

  • 最小的阿喀琉斯數

  • 第3個25邊形數


  • 正五邊形的每隻外角為72度

  • 兩個連續五位質數（31469,31397）的差

  • 4個連續質數之和：13+17+19+23=72displaystyle 13+17+19+23=72

  • 6個連續質數之和：5+7+11+13+17+19=72displaystyle 5+7+11+13+17+19=72

  • 最小的數可表達成兩個連續質數平方之差：112−72=192−172=72displaystyle 11^2-7^2=19^2-17^2=72


在科学



  • 鉿的原子序數[1]


在其它领域中


  • 七十二變

  • 《水滸傳》中的七十二地煞星。

  • 黃花崗七十二烈士

  • 所羅門七十二柱魔神


参考文献




  1. ^ Royal Society of Chemistry - Visual Element Periodic Table








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