670
670 is a composite number, even, a calendar year.
Historical context — 670 AD
Calendar year
Year 670 (DCLXX) was a common year starting on Tuesday of the Julian calendar, the 670th year of the Common Era (CE) and Anno Domini (AD) designations, the 670th year of the 1st millennium, the 70th year of the 7th century, and the 1st year of the 670s decade.
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Historical context — 670 BC
Calendar year
The year 670 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
-
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, 670
- Ended on
-
Saturday
December 31, 670
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
670s
670–679
- Century
-
7th century
601–700
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,356
1356 years before 2026.
In other calendars
- Hebrew
-
4430 / 4431 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
49 / 50 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Horse
Sexagenary cycle position 7 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1213 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
48 / 49 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
662 / 663 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
592 / 591 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 5 × 67
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- six hundred seventy
- Ordinal
- 670th
- Roman numeral
- DCLXX
- Binary
- 1010011110
- Octal
- 1236
- Hexadecimal
- 0x29E
- Base64
- Ap4=
- One's complement
- 64,865 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹 𒌋
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- χοʹ
- Mayan (base 20)
- 𝋡·𝋭·𝋪
- Chinese
- 六百七十
- Chinese (financial)
- 陸佰柒拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 670 = 0
- e — Euler's number (e)
- Digit 670 = 9
- φ — Golden ratio (φ)
- Digit 670 = 0
- √2 — Pythagoras's (√2)
- Digit 670 = 5
- ln 2 — Natural log of 2
- Digit 670 = 6
- γ — Euler-Mascheroni (γ)
- Digit 670 = 6
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 670, here are decompositions:
- 11 + 659 = 670
- 17 + 653 = 670
- 23 + 647 = 670
- 29 + 641 = 670
- 53 + 617 = 670
- 71 + 599 = 670
- 83 + 587 = 670
- 101 + 569 = 670
Showing the first eight; more decompositions exist.
UTF-8 encoding: CA 9E (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.158.
- Address
- 0.0.2.158
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.2.158
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 670 is an active NANP area code (North American Numbering Plan).
- Primary area
- Statewide
- Region
- Northern Mariana Islands
- 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.