99
99是98搭100之间个自然数。
- 第73个合数，正约数有1、3、9、11、33搭99。前一个为98、下一个为100。
- 第76个亏数，真约数和为57，亏度为42。前一个为98、下一个为101。
- 九九乘法表：一种以口诀般个方式方便背诵记忆个简单乘法学习法。
- 锿个原子序数。
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