Factor tree of 28
- Factor tree of 288
- Factor tree of 280
- Factor tree of 289
- Factor tree of 282
- Factor tree of 286
- Factor tree of 285
- Factor tree of 284
- Factor tree of 2808
- Factor tree of 2800
- Factor tree of 28 and 42
- Factor tree of 28 and 36
- Factor tree of 287
- Factor tree of 2880
- Factor tree of 281
- Factor tree of 2871