45
45是44搭46之间个自然数。
- 第30个合数，正约数有1、3、5、9、15搭45。前一个为44、下一个为46。
- 第35个亏数，真约数和为33，亏度为12。前一个为44、下一个为46。
- 三角形数、六边形数、十六边形数。
- 铑个原子序数。
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