2464 求约数个数
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描述
输入一个数字N,求其约数个数

提示信息
30%的数据是N≤1e6
60%的数据是N≤1e9
100%的数据是N≤1e18

输入样例 1
8

输出样例 1
4

输入样例 2
1000000000

输出样例 2
100

输入样例 3
1000000000000000000

输出样例 3
361

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