Number 
 | 
  
Kareyku 
 | 
 
1 
 | 
  tiri | 
2 
 | 
  kana | 
3 
 | 
  hatiri | 
4 
 | 
  hakana | 
5 
 | 
  soka | 
6 
 | 
  nawa | 
7 
 | 
  hasoka | 
8 
 | 
  hanawa | 
9 
 | 
  naka | 
10 
 | 
  haru | 
So, as can be seen here we have a clear sequence of groups of 2 or 4, that is tiri, kana, and then hatiri and hakana, which mean roughly "other 1" and "other 2" respectively. The last two number I have said had explanations in that 9 is clearly the word naka, "close, almost", and number 10 is haru "complete, perfect". One could consider this to be evidence of an older 4-based or 8-based system supplemented with a newer decimal system, but it nonetheless strikes as quite weird.
The numerals are used preceding the noun or object they modify:
naka vineru, nine men
hakana taro, four fathers
hasoka nakem, seven trees
And present no irregularities or variabilities.