286 (number)

← 285 286 287 →
← 200 210 220 230 240 250 260 270 280 290 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
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

• 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

• 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

• 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

1. "Composite numbers". mathworld.wolfram.com.
2. Sloane, N. J. A. (ed.). "SequenceA039772(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.
3. "Tetrahedral numbers". mathworld.wolfram.com.
4. "Sphenic numbers". mathworld.wolfram.com.
5. Sloane, N. J. A. (ed.). "SequenceA130433(Even pseudoprimes to base 3)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
6. "2.86 seconds to halve 10 matches". www.guinnessworldrecords.com.
7. "286 people at a tiramisu-making lesson". www.guinnessworldrecords.com.
8. "286 people in a steel drum ensemble". www.guinnessworldrecords.com.
9. "286 toy cars released at the same time". www.guinnessworldrecords.com.
10. "286 Iclea". in-the-sky.org.