89
89是88搭90之间个自然数。
- 第24个素数。前一个为83、下一个为97。
- 第68个亏数，真约数和为1，亏度为88。前一个为87、下一个为91。
- 第11个斐波那契数。前一个为55、下一个为144。
- 锕个原子序数。
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