270
270 is a composite number, even, a calendar year.
270 (two hundred seventy) is an even 3-digit number. It is a composite number with 16 divisors, and factors as 2 × 3³ × 5. Its proper divisors sum to 450, more than the number itself, making it an abundant number. Written other ways, in Roman numerals it is CCLXX and in binary, 100001110.
Interestingness
Historical context — 270 AD
Calendar year
Year 270 (CCLXX) was a common year starting on Saturday of the Julian calendar.
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Historical context — 270 BC
Calendar year
Year 270 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
- 52
- Started on
-
Saturday
January 1, 270
- Ended on
-
Saturday
December 31, 270
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
270s
270–279
- Century
-
3rd century
201–300
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,756
1756 years before 2026.
In other calendars
- Hebrew
-
4030 / 4031 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Metal zodiac:Tiger
Sexagenary cycle position 27 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
813 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
262 / 263 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
192 / 191 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 3 3 × 5
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√270 = [16; (2, 3, 6, 3, 2, 32)]
Period length 6 — the block in parentheses repeats forever.
Representations
- In words
- two hundred seventy
- Ordinal
- 270th
- Roman numeral
- CCLXX
- Binary
- 100001110
- Octal
- 416
- Hexadecimal
- 0x10E
- Base64
- AQ4=
- One's complement
- 65,265 (16-bit)
- Scientific notation
- 2.7 × 10²
- As a duration
- 270 s = 4 minutes, 30 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹 𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- σοʹ
- Mayan (base 20)
- 𝋭·𝋪
- Chinese
- 二百七十
- Chinese (financial)
- 貳佰柒拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 270 = 1
- e — Euler's number (e)
- Digit 270 = 5
- φ — Golden ratio (φ)
- Digit 270 = 2
- √2 — Pythagoras's (√2)
- Digit 270 = 1
- ln 2 — Natural log of 2
- Digit 270 = 2
- γ — Euler-Mascheroni (γ)
- Digit 270 = 2
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 270, here are decompositions:
- 7 + 263 = 270
- 13 + 257 = 270
- 19 + 251 = 270
- 29 + 241 = 270
- 31 + 239 = 270
- 37 + 233 = 270
- 41 + 229 = 270
- 43 + 227 = 270
Showing the first eight; more decompositions exist.
UTF-8 encoding: C4 8E (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.14.
- Address
- 0.0.1.14
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.1.14
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 270 is an active NANP area code (North American Numbering Plan).
- Primary area
- Bowling Green / Paducah
- Region
- Kentucky
- 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, 270 Hz is closest to:
- Concert pitch (A4 = 440 Hz): C♯4 (277.2 Hz, -45¢ — about midway to C4)
- Scientific pitch (C4 = 256 Hz): C♯4 (271.2 Hz, -8¢)
- Baroque pitch (A4 = 415 Hz): D4 (277 Hz, -44¢)
On an ingredients label, E270 is Lactic acid, a preservative.
270° is 3π/2 radians — a reflex angle (a three-quarter turn).
Related reading
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.