286 (number)
| ||||
|---|---|---|---|---|
| Cardinal | two hundred eighty-six | |||
| Ordinal | 286th (two hundred eighty-sixth) | |||
| Factorization | 2 × 11 × 13 | |||
| Divisors | 1, 2, 11, 13, 22, 26, 143, 286 | |||
| Greek numeral | ΣΠϚ´ | |||
| Roman numeral | CCLXXXVI | |||
| Binary | 1000111102 | |||
| Ternary | 1011213 | |||
| Senary | 11546 | |||
| Octal | 4368 | |||
| Duodecimal | 1BA12 | |||
| Hexadecimal | 11E16 | |||
286 is the natural number following 285 and preceding 287.
In mathematics
[edit]- 286 is an even composite number with 3 prime factors.[1]
- 286 is in the smallest pair of nontotient anagrams with 268.[2]
- 286 is a tetrahedral number which means that represents a tetrahedron.[3]
- 286 is a sphenic number which means that it has exactly 3 prime factors.[4]
- 286 the first even pseudoprime to base 3.[5]
World Records
[edit]- On November 7, 2013, Alastair Galpin received the Guinness World Record for the fastest time to slice 10 matches in half. He completed it in 2.86 seconds.[6]
- On April 27, 2013, the largest tiramisu-making lesson ensued in Japan with 286 participants.[7]
- On September 21, 2007, the largest steel drum ensemble was achieved in Poznan, Poland. There were 286 members.[8]
- On November 12, 2017, Toyota achieved the Guinness World Record for the greatest number of toy cars launched simultaneously. There were 286 toy cars.[9]
Other fields
[edit]- The calendar years 286 AD and 286 BC.
- 286 is the number of several highways in Japan and the United States.
- 286 Iclea is an asteroid in the asteroid belt. It was discovered by Johann Palisa in Vienna, Austria.[10]
References
[edit]- ^ "Composite numbers". mathworld.wolfram.com.
- ^ Sloane, N. J. A. (ed.). "Sequence A039772 (Even numbers k such that phi(k) and k-1 are distinct and have a common factor > 1)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ "Tetrahedral numbers". mathworld.wolfram.com.
- ^ "Sphenic numbers". mathworld.wolfram.com.
- ^ Sloane, N. J. A. (ed.). "Sequence A130433 (Even pseudoprimes to base 3)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ "2.86 seconds to halve 10 matches". www.guinnessworldrecords.com.
- ^ "286 people at a tiramisu-making lesson". www.guinnessworldrecords.com.
- ^ "286 people in a steel drum ensemble". www.guinnessworldrecords.com.
- ^ "286 toy cars released at the same time". www.guinnessworldrecords.com.
- ^ "286 Iclea". in-the-sky.org.
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