82
82 is a composite number, even, a calendar year.
82 (eighty-two) is an even 2-digit number. It is a composite number with 4 divisors, and factors as 2 × 41. Written other ways, in Roman numerals it is LXXXII and in binary, 1010010.
Interestingness
Historical context — 82 AD
Calendar year
AD 82 (LXXXII) was a common year starting on Tuesday of the Julian calendar.
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Historical context — 82 BC
Calendar year
Year 82 BC was a year of the pre-Julian Roman calendar.
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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
Primality
Prime factorization: 2 × 41
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√82 = [9; (18)]
Period length 1 — the block in parentheses repeats forever.
Representations
- In words
- eighty-two
- Ordinal
- 82nd
- Roman numeral
- LXXXII
- Binary
- 1010010
- Octal
- 122
- Hexadecimal
- 0x52
- Base64
- Ug==
- One's complement
- 173 (8-bit)
- Scientific notation
- 8.2 × 10¹
- As a duration
- 82 s = 1 minute, 22 seconds
As an angle
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
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'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
As an ASCII codepoint, 82 is R. Printable ASCII character R.
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.
Matches numbered highway designation:
- I-82 — Ellensburg, WA to Hermiston, OR.
Heard as a frequency, 82 Hz is closest to:
- Concert pitch (A4 = 440 Hz): E2 (82.4 Hz, -9¢)
- Scientific pitch (C4 = 256 Hz): E2 (80.6 Hz, +29¢)
- Baroque pitch (A4 = 415 Hz): F2 (82.3 Hz, -7¢)
As a MIDI note number, 82 is A♯5 (932.3 Hz at concert pitch).
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.