number.wiki

Number

86

86 is a composite number, even, a calendar year.

Arithmetic Number Deficient Number Evil Number Flippable Happy Number Padovan Number Recamán's Sequence Self Number Semiprime Squarefree Year

Historical context — 86 AD

Calendar year

AD 86 (LXXXVI) was a common year starting on Sunday of the Julian calendar.

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

Historical context — 86 BC

Calendar year

Year 86 BC was a year of the pre-Julian Roman calendar.

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

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: Tuesday
January 1, 86
Ended on: Tuesday
December 31, 86
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 80s
80–89
Century: 1st century
1–100
Millennium: 1st millennium
1–1000
Years ago: 1,940
1940 years before 2026.

In other calendars

Hebrew: 3846 / 3847 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Fire zodiac:Dog
Sexagenary cycle position 23 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 629 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 78 / 79 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 8 / 7 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 2
Digit sum: 14
Digit product: 48
Digital root: 5
Palindrome: No
Bit width: 7 bits
Reversed: 68
Flips to (rotate 180°): 98
Recamán's sequence: a(55) = 86
Square (n²): 7,396
Cube (n³): 636,056
Divisor count: 4
σ(n) — sum of divisors: 132
φ(n) — Euler's totient: 42
Sum of prime factors: 45

Primality

Prime factorization: 2 × 43

Nearest primes: 83 (−3) · 89 (+3)

Divisors & multiples

All divisors (4)

1 · 2 · 43 (half) · 86

Aliquot sum (sum of proper divisors): 46

Factor pairs (a × b = 86)

1 × 86

2 × 43

First multiples

86 · 172 (double) · 258 · 344 · 430 · 516 · 602 · 688 · 774 · 860

Sums & aliquot sequence

As consecutive integers: 20 + 21 + 22 + 23

Aliquot sequence: 86 → 46 → 26 → 16 → 15 → 9 → 4 → 3 → 1 → 0 — terminates at zero

Representations

In words: eighty-six
Ordinal: 86th
Roman numeral: LXXXVI
Binary: 1010110
Octal: 126
Hexadecimal: 0x56
Base64: Vg==
One's complement: 169 (8-bit)

In other bases

ternary (3) 10012

quaternary (4) 1112

quinary (5) 321

senary (6) 222

septenary (7) 152

nonary (9) 105

undecimal (11) 79

duodecimal (12) 72

tridecimal (13) 68

tetradecimal (14) 62

pentadecimal (15) 5b

Historical numeral systems

Babylonian (base 60): 𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): πϛʹ
Mayan (base 20): 𝋤·𝋦
Chinese: 八十六
Chinese (financial): 捌拾陸

In other modern scripts

Eastern Arabic ٨٦ Devanagari ८६ Bengali ৮৬ Tamil ௮௬ Thai ๘๖ Tibetan ༨༦ Khmer ៨៦ Lao ໘໖ Burmese ၈၆

Digit at this position in famous constants

π — Pi (π): Digit 86 = 0
e — Euler's number (e): Digit 86 = 3
φ — Golden ratio (φ): Digit 86 = 2
√2 — Pythagoras's (√2): Digit 86 = 3
ln 2 — Natural log of 2: Digit 86 = 8
γ — Euler-Mascheroni (γ): Digit 86 = 9

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 86, here are decompositions:

3 + 83 = 86
7 + 79 = 86
13 + 73 = 86
19 + 67 = 86
43 + 43 = 86

ASCII character

As an ASCII codepoint, 86 is V. Printable ASCII character V.

Hex color

#000056

RGB(0, 0, 86)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.86.

Address: 0.0.0.86
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.86

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

US numbered highway

Matches numbered highway designation:

I-86 — Two segments: New York's Southern Tier and Idaho.

Interstate 86 on Wikipedia ↗