69 (sixty-nine) is the natural number following 68 and preceding 70.
| ||||
---|---|---|---|---|
Cardinal | sixty-nine | |||
Ordinal | 69th (sixty-ninth) | |||
Factorization | 3 × 23 | |||
Divisors | 1, 3, 23, 69 | |||
Greek numeral | ΞΘ´ | |||
Roman numeral | LXIX | |||
Binary | 10001012 | |||
Ternary | 21203 | |||
Senary | 1536 | |||
Octal | 1058 | |||
Duodecimal | 5912 | |||
Hexadecimal | 4516 |
69 is:
Because 69 has an odd number of 1s in its binary representation, it is sometimes called an "odious number."
In decimal, 69 is the only natural number whose square (4761) and cube (328509) use every digit from 0–9 exactly once.[7]
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.
On many handheld scientific and graphing calculators, the highest factorial that can be calculated, due to memory limitations, is 69!, or about 1.711224524×1098.
Sixty-nine may also refer to: