The folowing table expresses '90' in various number bases. 'DR_{x}' shows the result of 'digit reducing' resulting in an X-digit long number.

Base | DR_{7} | DR_{6} | DR_{5} | DR_{4} | DR_{3} | DR_{2} | DR_{1} |
---|---|---|---|---|---|---|---|

2 | 1011010 | 100 | 1 | ||||

3 | 10100 | 2 | |||||

4 | 1122 | 12 | 3 | ||||

5 | 330 | 11 | 2 | ||||

6 | 230 | 5 | |||||

7 | 156 | 15 | 6 | ||||

8 | 132 | 6 | |||||

9 | 110 | 2 | |||||

10 | 90 | 9 | |||||

11 | 82 | A | |||||

12 | 76,11 | 2 | |||||

13 | 6C,15 | 6 | |||||

14 | 66 | C | |||||

15 | 60 | 6 | |||||

16 | 5A | F |

Factors: 2 * 3^{2} * 5

90 is the interior angle of a 'Square (or Tetragon)' (see 'regular polygons').

A 'Enneacontagon' is a 'regular polygon' with 90 sides.

90 is the atomic weight of Thorium (Th).

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