The folowing table expresses '690' in various number bases. 'DRx' shows the result of 'digit reducing' resulting in an X-digit long number.
| Base | DR10 | DR9 | DR8 | DR7 | DR6 | DR5 | DR4 | DR3 | DR2 | DR1 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2 | 1010110010 | 101 | 10 | 1 | ||||||
| 3 | 221120 | 22,11 | 2 | |||||||
| 4 | 22302 | 21 | 3 | |||||||
| 5 | 10230 | 11 | 2 | |||||||
| 6 | 3110 | 5 | ||||||||
| 7 | 2004 | 6 | ||||||||
| 8 | 1262 | 13 | 4 | |||||||
| 9 | 846 | 20 | 2 | |||||||
| 10 | 690 | 15 | 6 | |||||||
| 11 | 578 | 19 | A | |||||||
| 12 | 496 | 17 | 8 | |||||||
| 13 | 411 | 6 | ||||||||
| 14 | 374 | 10 | 1 | |||||||
| 15 | 310 | 4 | ||||||||
| 16 | 2B2 | F |
Factors: 2 * 3 * 5 * 23