There are an infinite number of them.
If you're only interested in positive, whole numbers, then there are 8 of them:
1, 2, 4, 5, 8, 10, 20, and 40.
Any number that's equal to 40 or less can go into 40, but
most of them will not do so evenly.
The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40.
It depends which number you are referring to.
Eleven.
40, 80, 120, 160, 200 +40 . . .
It is 1
290 ÷ 40 = 7 with remainder 10
40 of them.
The gcf is 8
40/8=5
40 times
40 goes into 5,000 125 times.
40 and 63 have no common prime factors.
2000/50 = 40 40 50s can go into 2000.