The folowing table expresses '684' 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 | 1010101100 | 101 | 10 | 1 | ||||||
| 3 | 221100 | 20 | 2 | |||||||
| 4 | 22230 | 21 | 3 | |||||||
| 5 | 10214 | 13 | 4 | |||||||
| 6 | 3100 | 4 | ||||||||
| 7 | 1665 | 24 | 6 | |||||||
| 8 | 1254 | 14 | 5 | |||||||
| 9 | 840 | 13 | 4 | |||||||
| 10 | 684 | 18 | 9 | |||||||
| 11 | 572 | 13 | 4 | |||||||
| 12 | 490 | 11 | 2 | |||||||
| 13 | 408 | C | ||||||||
| 14 | 36C | 17 | 8 | |||||||
| 15 | 309 | C | ||||||||
| 16 | 2AC | 18 | 9 |
Factors: 22 * 32 * 19
684 is in the Pythagorean Triples: (37, 684, 685), (684, 1363, 1525).