268
268 is a composite number, even, a calendar year.
268 (two hundred sixty-eight) is an even 3-digit number. It is a composite number with 6 divisors, and factors as 2² × 67. Written other ways, in Roman numerals it is CCLXVIII and in binary, 100001100.
Interestingness
Historical context — 268 AD
Calendar year
Year 268 (CCLXVIII) was a leap year starting on Wednesday of the Julian calendar.
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Historical context — 268 BC
Calendar year
Year 268 BC was a year of the pre-Julian Roman calendar.
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Year facts
- Year type
-
Leap year
Divisible by 4 and not by 100; February has 29 days.
- Days in year
- 366
- ISO weeks
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Wednesday
January 1, 268
- Ended on
-
Thursday
December 31, 268
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
260s
260–269
- Century
-
3rd century
201–300
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,758
1758 years before 2026.
In other calendars
- Hebrew
-
4028 / 4029 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Earth zodiac:Rat
Sexagenary cycle position 25 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
811 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
260 / 261 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
190 / 189 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 2 × 67
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√268 = [16; (2, 1, 2, 3, 3, 1, 3, 1, 10, 8, 10, 1, 3, 1, 3, 3, 2, 1, 2, 32)]
Period length 20 — the block in parentheses repeats forever.
Representations
- In words
- two hundred sixty-eight
- Ordinal
- 268th
- Roman numeral
- CCLXVIII
- Binary
- 100001100
- Octal
- 414
- Hexadecimal
- 0x10C
- Base64
- AQw=
- One's complement
- 65,267 (16-bit)
- Scientific notation
- 2.68 × 10²
- As a duration
- 268 s = 4 minutes, 28 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- σξηʹ
- Mayan (base 20)
- 𝋭·𝋨
- Chinese
- 二百六十八
- Chinese (financial)
- 貳佰陸拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 268 = 8
- e — Euler's number (e)
- Digit 268 = 1
- φ — Golden ratio (φ)
- Digit 268 = 1
- √2 — Pythagoras's (√2)
- Digit 268 = 8
- ln 2 — Natural log of 2
- Digit 268 = 5
- γ — Euler-Mascheroni (γ)
- Digit 268 = 0
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 268, here are decompositions:
- 5 + 263 = 268
- 11 + 257 = 268
- 17 + 251 = 268
- 29 + 239 = 268
- 41 + 227 = 268
- 71 + 197 = 268
- 89 + 179 = 268
- 101 + 167 = 268
Showing the first eight; more decompositions exist.
UTF-8 encoding: C4 8C (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.12.
- Address
- 0.0.1.12
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.1.12
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 268 is an active NANP area code (North American Numbering Plan).
- Primary area
- Statewide
- Region
- Antigua and Barbuda
- Country
- Antigua and Barbuda
Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.
Heard as a frequency, 268 Hz is closest to:
- Concert pitch (A4 = 440 Hz): C4 (261.6 Hz, +42¢)
- Scientific pitch (C4 = 256 Hz): C♯4 (271.2 Hz, -21¢)
- Baroque pitch (A4 = 415 Hz): C♯4 (261.4 Hz, +43¢)
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.