Numeric Value: 28
The folowing table expresses '28' in various number bases. 'DRx' shows the result of 'digit reducing' resulting in an X-digit long number.
| Base | DR5 | DR4 | DR3 | DR2 | DR1 |
|---|---|---|---|---|---|
| 2 | 11100 | 11,10 | 1 | ||
| 3 | 1001 | 2 | |||
| 4 | 130 | 10 | 1 | ||
| 5 | 103 | 4 | |||
| 6 | 44,12 | 3 | |||
| 7 | 40 | 4 | |||
| 8 | 34 | 7 | |||
| 9 | 31 | 4 | |||
| 10 | 28,10 | 1 | |||
| 11 | 26 | 8 | |||
| 12 | 24 | 6 | |||
| 13 | 22 | 4 | |||
| 14 | 20 | 2 | |||
| 15 | 1D | E | |||
| 16 | 1C | D |
Math World
Factors: 22 * 7
28 is in the Pythagorean Triples: (28, 195, 197), (28, 45, 53).
28 is the sum of the counting numbers from 1 to 7 (See 'The Sum/Product of the First N Counting Numbers').
28 is the 2nd Perfect Number.
Physical World
28 is the atomic weight of Nickel (Ni).
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