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|---|---|---|---|---|
| Cardinal | two hundred eighty | |||
| Ordinal | 280th (two hundred eightieth) | |||
| Factorization | 23 × 5 × 7 | |||
| Greek numeral | ΣΠ´ | |||
| Roman numeral | CCLXXX | |||
| Binary | 1000110002 | |||
| Ternary | 1011013 | |||
| Senary | 11446 | |||
| Octal | 4308 | |||
| Duodecimal | 1B412 | |||
| Hexadecimal | 11816 | |||
280 (two hundred [and] eighty) is the natural number after 279 and before 281.
The denominator of the eighth harmonic number, [1] 280 is an octagonal number. [2] 280 is the smallest octagonal number that is a half of another octagonal number.
There are 280 plane trees with ten nodes. As a consequence of this, 18 people around a round table can shake hands with each other in non-crossing ways, in 280 different ways (this includes rotations). [ disputed ]
65 (sixty-five) is the natural number following 64 and preceding 66.
96 (ninety-six) is the natural number following 95 and preceding 97. It is a number that appears the same when turned upside down.
113 is the natural number following 112 and preceding 114.
1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it can be written with or without a comma or sometimes a period separating the thousands digit: 1,000.
400 is the natural number following 399 and preceding 401.
700 is the natural number following 699 and preceding 701.
600 is the natural number following 599 and preceding 601.
800 is the natural number following 799 and preceding 801.
2000 is a natural number following 1999 and preceding 2001.
3000 is the natural number following 2999 and preceding 3001. It is the smallest number requiring thirteen letters in English.
5000 is the natural number following 4999 and preceding 5001. Five thousand is the largest isogrammic numeral in the English language.
6000 is the natural number following 5999 and preceding 6001.
8000 is the natural number following 7999 and preceding 8001.
135 is the natural number following 134 and preceding 136.
100,000 (one hundred thousand) is the natural number following 99,999 and preceding 100,001. In scientific notation, it is written as 105.
225 is the natural number following 224 and preceding 226.
270 is the natural number following 269 and preceding 271.
20,000 is the natural number that comes after 19,999 and before 20,001.
30,000 is the natural number that comes after 29,999 and before 30,001.
50,000 is the natural number that comes after 49,999 and before 50,001.