Ok Pearly, you asked for it
Multiples of 2 are good, but not 4
1 is good because it's the base of all numbers
3 is good because it's simple and divides by itself nicely
9 is good because it's 3x3
4 is bad because it's just less than 5
5 is good because it's half of 10
10 is good because it's 5 doubled and 10 is the basis for measurement and everything
100 is a good number too, because it's like a massive 10
Now onto double digit numbers! I think it'll be best to do this with examples, rather than explain my complicated arbitrary rules
25 is good because 2 and 5 are the best numbers.
44 makes me seriously uncomfortable, because of the two 4s
38 is neutral
14 initially makes me uncomfy until I realise 1+4=5, which makes me feel better
95 is an awesome number, because of the goodness of 9 and 5, but also because 95+5=100
81 is neutral
30 is a good number (same for all the other good single digit numbers with a 0 on the end)