The folowing table expresses '645' 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 | 1010000101 | 100 | 1 | |||||||
| 3 | 212220 | 100 | 1 | |||||||
| 4 | 22011 | 12 | 3 | |||||||
| 5 | 10040 | 10 | 1 | |||||||
| 6 | 2553 | 23 | 5 | |||||||
| 7 | 1611 | 12 | 3 | |||||||
| 8 | 1205 | 10 | 1 | |||||||
| 9 | 786 | 23 | 5 | |||||||
| 10 | 645 | 15 | 6 | |||||||
| 11 | 537 | 14 | 5 | |||||||
| 12 | 459 | 16 | 7 | |||||||
| 13 | 3A8 | 18 | 9 | |||||||
| 14 | 341 | 8 | ||||||||
| 15 | 2D0 | 10 | 1 | |||||||
| 16 | 285 | F |
Factors: 3 * 5 * 43
645 is in the Pythagorean Triple: (645, 812, 1037).