The folowing table expresses '780' in various number bases. 'DR_{x}' shows the result of 'digit reducing' resulting in an X-digit long number.

Base | DR_{10} | DR_{9} | DR_{8} | DR_{7} | DR_{6} | DR_{5} | DR_{4} | DR_{3} | DR_{2} | DR_{1} |
---|---|---|---|---|---|---|---|---|---|---|

2 | 1100001100 | 100 | 1 | |||||||

3 | 1001220 | 20 | 2 | |||||||

4 | 30030 | 12 | 3 | |||||||

5 | 11110 | 4 | ||||||||

6 | 3340 | 14 | 5 | |||||||

7 | 2163 | 15 | 6 | |||||||

8 | 1414 | 12 | 3 | |||||||

9 | 1056 | 13 | 4 | |||||||

10 | 780 | 15 | 6 | |||||||

11 | 64A | 19 | A | |||||||

12 | 550 | A | ||||||||

13 | 480 | C | ||||||||

14 | 3DA | 1C | D | |||||||

15 | 370 | A | ||||||||

16 | 30C | F |

Factors: 2^{2} * 3 * 5 * 13

780 is the sum of the counting numbers from 1 to 39 (See 'The Sum/Product of the First N Counting Numbers').

780 is in the Pythagorean Triples: (780, 1421, 1621), (451, 780, 901), (731, 780, 1069).

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