208
208 is a composite number, even, a calendar year.
208 (two hundred eight) is an even 3-digit number. It is a composite number with 10 divisors, and factors as 2⁴ × 13. Its proper divisors sum to 226, more than the number itself, making it an abundant number. Written other ways, in Roman numerals it is CCVIII and in binary, 11010000.
Interestingness
Historical context — 208 AD
Calendar year
Year 208 (CCVIII) was a leap year starting on Friday of the Julian calendar.
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Historical context — 208 BC
Calendar year
Year 208 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
-
Friday
January 1, 208
- Ended on
-
Saturday
December 31, 208
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
200s
200–209
- Century
-
3rd century
201–300
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,818
1818 years before 2026.
In other calendars
- Hebrew
-
3968 / 3969 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
-
751 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
200 / 201 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
130 / 129 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 4 × 13
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√208 = [14; (2, 2, 1, 2, 2, 28)]
Period length 6 — the block in parentheses repeats forever.
Representations
- In words
- two hundred eight
- Ordinal
- 208th
- Roman numeral
- CCVIII
- Binary
- 11010000
- Octal
- 320
- Hexadecimal
- 0xD0
- Base64
- 0A==
- One's complement
- 47 (8-bit)
- Scientific notation
- 2.08 × 10²
- As a duration
- 208 s = 3 minutes, 28 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- σηʹ
- Mayan (base 20)
- 𝋪·𝋨
- Chinese
- 二百零八
- Chinese (financial)
- 貳佰零捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 208 = 0
- e — Euler's number (e)
- Digit 208 = 4
- φ — Golden ratio (φ)
- Digit 208 = 8
- √2 — Pythagoras's (√2)
- Digit 208 = 9
- ln 2 — Natural log of 2
- Digit 208 = 4
- γ — Euler-Mascheroni (γ)
- Digit 208 = 5
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 208, here are decompositions:
- 11 + 197 = 208
- 17 + 191 = 208
- 29 + 179 = 208
- 41 + 167 = 208
- 59 + 149 = 208
- 71 + 137 = 208
- 101 + 107 = 208
UTF-8 encoding: C3 90 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.208.
- Address
- 0.0.0.208
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.208
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 208 is an active NANP area code (North American Numbering Plan).
- Primary area
- Statewide
- Region
- Idaho
- 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, 208 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G♯3 (207.7 Hz, +3¢)
- Scientific pitch (C4 = 256 Hz): G♯3 (203.2 Hz, +41¢)
- Baroque pitch (A4 = 415 Hz): A3 (207.5 Hz, +4¢)
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.