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Number

287

287 is a composite number, odd, a calendar year.

Arithmetic Number Deficient Number Evil Number Pentagonal Recamán's Sequence Semiprime Squarefree Year

Historical context — 287 AD

Calendar year

Year 287 (CCLXXXVII) was a common year starting on Saturday of the Julian calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →

Notable events — 287 BC

Undated The Lex Hortensia makes plebiscites binding on all Roman citizens; Archimedes is born around this time.

Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0

Year facts

Year type: Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
Days in year: 365
ISO weeks: 52
Started on: Saturday
January 1, 287
Ended on: Saturday
December 31, 287
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 280s
280–289
Century: 3rd century
201–300
Millennium: 1st millennium
1–1000
Years ago: 1,739
1739 years before 2026.

In other calendars

Hebrew: 4047 / 4048 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Fire zodiac:Goat
Sexagenary cycle position 44 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 830 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 279 / 280 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 209 / 208 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 17
Digit product: 112
Digital root: 8
Palindrome: No
Bit width: 9 bits
Reversed: 782
Recamán's sequence: a(674) = 287
Square (n²): 82,369
Cube (n³): 23,639,903
Divisor count: 4
σ(n) — sum of divisors: 336
φ(n) — Euler's totient: 240
Sum of prime factors: 48

Primality

Prime factorization: 7 × 41

Nearest primes: 283 (−4) · 293 (+6)

Divisors & multiples

All divisors (4)

1 · 7 · 41 · 287

Aliquot sum (sum of proper divisors): 49

Factor pairs (a × b = 287)

1 × 287

7 × 41

First multiples

287 · 574 (double) · 861 · 1,148 · 1,435 · 1,722 · 2,009 · 2,296 · 2,583 · 2,870

Sums & aliquot sequence

As consecutive integers: 143 + 144 38 + 39 + … + 44 14 + 15 + … + 27

Aliquot sequence: 287 → 49 → 8 → 7 → 1 → 0 — terminates at zero

Representations

In words: two hundred eighty-seven
Ordinal: 287th
Roman numeral: CCLXXXVII
Binary: 100011111
Octal: 437
Hexadecimal: 0x11F
Base64: AR8=
One's complement: 65,248 (16-bit)

In other bases

ternary (3) 101122

quaternary (4) 10133

quinary (5) 2122

senary (6) 1155

septenary (7) 560

nonary (9) 348

undecimal (11) 241

duodecimal (12) 1bb

tridecimal (13) 191

tetradecimal (14) 167

pentadecimal (15) 142

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): σπζʹ
Mayan (base 20): 𝋮·𝋧
Chinese: 二百八十七
Chinese (financial): 貳佰捌拾柒

In other modern scripts

Eastern Arabic ٢٨٧ Devanagari २८७ Bengali ২৮৭ Tamil ௨௮௭ Thai ๒๘๗ Tibetan ༢༨༧ Khmer ២៨៧ Lao ໒໘໗ Burmese ၂၈၇

Digit at this position in famous constants

π — Pi (π): Digit 287 = 6
e — Euler's number (e): Digit 287 = 5
φ — Golden ratio (φ): Digit 287 = 7
√2 — Pythagoras's (√2): Digit 287 = 6
ln 2 — Natural log of 2: Digit 287 = 1
γ — Euler-Mascheroni (γ): Digit 287 = 0

Also seen as

Unicode codepoint

ğ

Latin Small Letter G With Breve

U+011F

Lowercase letter (Ll)

UTF-8 encoding: C4 9F (2 bytes).

Lookup U+011F on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00011F

RGB(0, 1, 31)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.31.

Address: 0.0.1.31
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.1.31

Unspecified address (0.0.0.0/8) — "this network" placeholder.