69 (number)
From Wikipedia, the free encyclopedia
| Cardinal | 69 sixty-nine |
| Ordinal | 69th sixty-ninth |
| Numeral system | sexagesimal |
| Factorization |  |
| Divisors | 1, 3, 23, 69 |
| Roman numeral | LXIX |
| Binary | 1000101 |
| Octal | 105 |
| Duodecimal | 59 |
| Hexadecimal | 45 |
69 (sixty-nine) is the natural number following 68 and preceding 70.
[edit] In mathematics
Adding up the divisors of 1 through 9 gives 69.
Because 69 has an odd number of 1s in its binary representation, it is sometimes called an "odious number"
Something to note is that 6932 = 6969007...
Another thing to note is that 692 (4 761) and 693 (328 509) uses every digit from 0-9.
69 is equal to 105 octal, while 105 is equal to 69 hexadecimal. This same property can be applied to all numbers from 64 to 69.
69 is a semiprime.
On many handheld scientific and graphing calculators, the highest factorial that can be computed within memory limitations is 69! or 1.711224524*1098.
[edit] In science
- The atomic number of thulium, a lanthanide
[edit] Astronomy
The Messier object M69 is a magnitude 9.0 globular cluster in the constellation Sagittarius.
