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

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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

^ "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.

[1] "Composite numbers". mathworld.wolfram.com.

[2] 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.

[3] "Tetrahedral numbers". mathworld.wolfram.com.

[4] "Sphenic numbers". mathworld.wolfram.com.

[5] Sloane, N. J. A. (ed.). "Sequence A130433 (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.

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