Number

268

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

Ascending Digits Deficient Number Odious Number Pernicious Number Recamán's Sequence Year

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.

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

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

Parity: Even
Digit count: 3
Digit sum: 16
Digit product: 96
Digital root: 7
Palindrome: No
Bit width: 9 bits
Reversed: 862
Recamán's sequence: a(135) = 268
Square (n²): 71,824
Cube (n³): 19,248,832
Divisor count: 6
σ(n) — sum of divisors: 476
φ(n) — Euler's totient: 132
Sum of prime factors: 71

Primality

Prime factorization: 2 ² × 67

Nearest primes: 263 (−5) · 269 (+1)

Divisors & multiples

All divisors (6)

1 · 2 · 4 · 67 · 134 (half) · 268

Aliquot sum (sum of proper divisors): 208

Factor pairs (a × b = 268)

1 × 268

2 × 134

4 × 67

First multiples

268 · 536 (double) · 804 · 1,072 · 1,340 · 1,608 · 1,876 · 2,144 · 2,412 · 2,680

Sums & aliquot sequence

As consecutive integers: 30 + 31 + … + 37

Aliquot sequence: 268 → 208 → 226 → 116 → 94 → 50 → 43 → 1 → 0 — terminates at zero

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)

In other bases

ternary (3) 100221

quaternary (4) 10030

quinary (5) 2033

senary (6) 1124

septenary (7) 532

nonary (9) 327

undecimal (11) 224

duodecimal (12) 1a4

tridecimal (13) 178

tetradecimal (14) 152

pentadecimal (15) 12d

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

In other modern scripts

Eastern Arabic ٢٦٨ Devanagari २६८ Bengali ২৬৮ Tamil ௨௬௮ Thai ๒๖๘ Tibetan ༢༦༨ Khmer ២៦៨ Lao ໒໖໘ Burmese ၂၆၈

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 decomposition

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.

Unicode codepoint

Latin Capital Letter C With Caron

U+010C

Uppercase letter (Lu)

UTF-8 encoding: C4 8C (2 bytes).

Lookup U+010C on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00010C

RGB(0, 1, 12)

IPv4 address

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.

NANP area code 268

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.

Look up area code 268 ↗