260
260 is a composite number, even, a calendar year.
260 (two hundred sixty) is an even 3-digit number. It is a composite number with 12 divisors, and factors as 2² × 5 × 13. Its proper divisors sum to 328, more than the number itself, making it an abundant number. Written other ways, in Roman numerals it is CCLX and in binary, 100000100.
Interestingness
Historical context — 260 AD
Calendar year
Year 260 (CCLX) was a leap year starting on Sunday of the Julian calendar.
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Historical context — 260 BC
Calendar year
Year 260 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
- 52
- Started on
-
Sunday
January 1, 260
- Ended on
-
Monday
December 31, 260
- Friday the 13ths
-
3
3 Friday the 13ths this year.
- Decade
-
260s
260–269
- Century
-
3rd century
201–300
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,766
1766 years before 2026.
In other calendars
- Hebrew
-
4020 / 4021 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Metal zodiac:Dragon
Sexagenary cycle position 17 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
803 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
252 / 253 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
182 / 181 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 2 × 5 × 13
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√260 = [16; (8, 32)]
Period length 2 — the block in parentheses repeats forever.
Representations
- In words
- two hundred sixty
- Ordinal
- 260th
- Roman numeral
- CCLX
- Binary
- 100000100
- Octal
- 404
- Hexadecimal
- 0x104
- Base64
- AQQ=
- One's complement
- 65,275 (16-bit)
- Scientific notation
- 2.6 × 10²
- As a duration
- 260 s = 4 minutes, 20 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹 𒌋𒌋
- Egyptian hieroglyphic
- 𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- σξʹ
- Mayan (base 20)
- 𝋭·𝋠
- Chinese
- 二百六十
- Chinese (financial)
- 貳佰陸拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 260 = 9
- e — Euler's number (e)
- Digit 260 = 1
- φ — Golden ratio (φ)
- Digit 260 = 1
- √2 — Pythagoras's (√2)
- Digit 260 = 2
- ln 2 — Natural log of 2
- Digit 260 = 4
- γ — Euler-Mascheroni (γ)
- Digit 260 = 0
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 260, here are decompositions:
- 3 + 257 = 260
- 19 + 241 = 260
- 31 + 229 = 260
- 37 + 223 = 260
- 61 + 199 = 260
- 67 + 193 = 260
- 79 + 181 = 260
- 97 + 163 = 260
Showing the first eight; more decompositions exist.
UTF-8 encoding: C4 84 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.4.
- Address
- 0.0.1.4
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.1.4
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 260 is an active NANP area code (North American Numbering Plan).
- Primary area
- Fort Wayne
- Region
- Indiana
- Country
- United States
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, 260 Hz is closest to:
- Concert pitch (A4 = 440 Hz): C4 (261.6 Hz, -11¢)
- Scientific pitch (C4 = 256 Hz): C4 (256 Hz, +27¢)
- Baroque pitch (A4 = 415 Hz): C♯4 (261.4 Hz, -10¢)
On an ingredients label, E260 is Acetic acid, a preservative — the acid of vinegar.
Related reading
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.