Four of them.
4, 12, 36
Three of them are . . . 4, 12, and 36.
A prime number is a positive integer that has exactly two factors - 1 and itself. A prime number has only two factors which are itself and one.
The positive integer factors of 28 are: 1, 2, 4, 7, 14, 28
8 of them.
The positive integer factors of 304 are: 1, 2, 4, 8, 16, 19, 38, 76, 152, 304 This is a total of 10 positive integer factors.
4
There are 4 positive integer factors of 1981. These are: 1, 7, 283, 1981
Including itself and 1, the number 7429 has eight positive integer factors. They are: 1, 17, 19, 23, 323, 391, 437, 7429
Four of them.
4, 12, 36
The number 83 is prime. The only positive integer factors of 83 are itself and 1.
16 has five positive integer factors. They are 1, 2, 4, 8, and 16.
The number 853 is prime - it has no positive integer factors other than itself and 1.
Three of them are . . . 4, 12, and 36.
2, 6, 74 and 222 Four of them.