180 (number)
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| Cardinal | one hundred eighty |
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| Ordinal | 180th
(one hundred eightieth) |
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| Factorization | 22× 32× 5 |
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| Divisors | 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180 |
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| Greek numeral | ΡΠ´ |
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| Roman numeral | CLXXX |
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| Binary | 101101002 |
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| Ternary | 202003 |
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| Quaternary | 23104 |
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| Quinary | 12105 |
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| Senary | 5006 |
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| Octal | 2648 |
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| Duodecimal | 13012 |
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| Hexadecimal | B416 |
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| Vigesimal | 9020 |
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| Base 36 | 5036 |
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The number 180 is a number that comes after 179 and before 181. It is an even number and a whole number.
Mathematics
- 180 is a composite number, which means it can be divided by numbers other than 1 and itself.
- It has many divisors: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, and 180.
- The prime factors of 180 are 2, 3, and 5. Written in prime factorization, it is 2^2×3^2×5.
- 180 is a Harshad number, which means it can be divided by the sum of its digits (1 + 8 + 0 = 9).
Angles
- 180 degrees is the measure of a straight angle. A straight line makes a 180-degree angle.
- In a triangle, the sum of the three angles is always 180 degrees.
In Everyday Life
- People sometimes say "doing a 180" when they mean making a complete change in direction or opinion.
- In darts, scoring 180 in one turn (three darts hitting triple 20) is the highest possible score.