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Number

82

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

Deficient Number Happy Number Odious Number Pernicious Number Recamán's Sequence Semiprime Squarefree Year

Historical context — 82 AD

Calendar year

AD 82 (LXXXII) was a common year starting on Tuesday of the Julian calendar.

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

Historical context — 82 BC

Calendar year

Year 82 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: 53
Long year: contains 53 ISO weeks.
Started on: Thursday
January 1, 82
Ended on: Thursday
December 31, 82
Friday the 13ths: 3
3 Friday the 13ths this year.
Decade: 80s
80–89
Century: 1st century
1–100
Millennium: 1st millennium
1–1000
Years ago: 1,944
1944 years before 2026.

In other calendars

Hebrew: 3842 / 3843 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Water zodiac:Horse
Sexagenary cycle position 19 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 625 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 74 / 75 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 4 / 3 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 2
Digit sum: 10
Digit product: 16
Digital root: 1
Palindrome: No
Bit width: 7 bits
Reversed: 28
Recamán's sequence: a(47) = 82
Square (n²): 6,724
Cube (n³): 551,368
Divisor count: 4
σ(n) — sum of divisors: 126
φ(n) — Euler's totient: 40
Sum of prime factors: 43

Primality

Prime factorization: 2 × 41

Nearest primes: 79 (−3) · 83 (+1)

Divisors & multiples

All divisors (4)

1 · 2 · 41 (half) · 82

Aliquot sum (sum of proper divisors): 44

Factor pairs (a × b = 82)

1 × 82

2 × 41

First multiples

82 · 164 (double) · 246 · 328 · 410 · 492 · 574 · 656 · 738 · 820

Sums & aliquot sequence

As a sum of two squares: 1² + 9²

As consecutive integers: 19 + 20 + 21 + 22

Aliquot sequence: 82 → 44 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Representations

In words: eighty-two
Ordinal: 82nd
Roman numeral: LXXXII
Binary: 1010010
Octal: 122
Hexadecimal: 0x52
Base64: Ug==
One's complement: 173 (8-bit)

In other bases

ternary (3) 10001

quaternary (4) 1102

quinary (5) 312

senary (6) 214

septenary (7) 145

nonary (9) 101

undecimal (11) 75

duodecimal (12) 6a

tridecimal (13) 64

tetradecimal (14) 5c

pentadecimal (15) 57

Historical numeral systems

Babylonian (base 60): 𒁹 𒌋𒌋𒁹𒁹
Egyptian hieroglyphic: 𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺
Greek (Milesian): πβʹ
Mayan (base 20): 𝋤·𝋢
Chinese: 八十二
Chinese (financial): 捌拾貳

In other modern scripts

Eastern Arabic ٨٢ Devanagari ८२ Bengali ৮২ Tamil ௮௨ Thai ๘๒ Tibetan ༨༢ Khmer ៨២ Lao ໘໒ Burmese ၈၂

Digit at this position in famous constants

π — Pi (π): Digit 82 = 8
e — Euler's number (e): Digit 82 = 4
φ — Golden ratio (φ): Digit 82 = 9
√2 — Pythagoras's (√2): Digit 82 = 8
ln 2 — Natural log of 2: Digit 82 = 5
γ — Euler-Mascheroni (γ): Digit 82 = 0

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 82, here are decompositions:

3 + 79 = 82
11 + 71 = 82
23 + 59 = 82
29 + 53 = 82
41 + 41 = 82

ASCII character

As an ASCII codepoint, 82 is R. Printable ASCII character R.

Hex color

#000052

RGB(0, 0, 82)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.82.

Address: 0.0.0.82
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.82

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

US numbered highway

Matches numbered highway designation:

I-82 — Ellensburg, WA to Hermiston, OR.

Interstate 82 on Wikipedia ↗