Random
How many factors of 1296 are perfect squares?
9
1,4,9,16,36,81,144,324,1296
How many 3 digit integers have exactly 3 factors?
7
112 ,132, 172,192,232,292,312
How many factors of 480 are even?
20
24 factors - 4 odd factors (1,3,5 and 15)
How many perfect squares less than 399 have more than 3 factors?
10
What is the smallest positive integer that has exactly 18 factors?
180
22 x 32 x 5