778
778 is a composite number, even, a calendar year.
Historical context — 778 AD
Calendar year
Year 778 (DCCLXXVIII) was a common year starting on Thursday of the Julian calendar, the 778th year of the Common Era (CE) and Anno Domini (AD) designations, the 778th year of the 1st millennium, the 78th year of the 8th century, and the 9th year of the 770s decade.
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Historical context — 778 BC
Decade
This article concerns the period 779 BC – 770 BC.
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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
-
Sunday
January 1, 778
- Ended on
-
Sunday
December 31, 778
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
770s
770–779
- Century
-
8th century
701–800
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,248
1248 years before 2026.
In other calendars
- Hebrew
-
4538 / 4539 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
161 / 162 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Horse
Sexagenary cycle position 55 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1321 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
156 / 157 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
770 / 771 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
700 / 699 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 389
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- seven hundred seventy-eight
- Ordinal
- 778th
- Roman numeral
- DCCLXXVIII
- Binary
- 1100001010
- Octal
- 1412
- Hexadecimal
- 0x30A
- Base64
- Awo=
- One's complement
- 64,757 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ψοηʹ
- Mayan (base 20)
- 𝋡·𝋲·𝋲
- Chinese
- 七百七十八
- Chinese (financial)
- 柒佰柒拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 778 = 9
- e — Euler's number (e)
- Digit 778 = 9
- φ — Golden ratio (φ)
- Digit 778 = 7
- √2 — Pythagoras's (√2)
- Digit 778 = 8
- ln 2 — Natural log of 2
- Digit 778 = 9
- γ — Euler-Mascheroni (γ)
- Digit 778 = 7
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 778, here are decompositions:
- 5 + 773 = 778
- 17 + 761 = 778
- 59 + 719 = 778
- 101 + 677 = 778
- 131 + 647 = 778
- 137 + 641 = 778
- 179 + 599 = 778
- 191 + 587 = 778
Showing the first eight; more decompositions exist.
UTF-8 encoding: CC 8A (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.10.
- Address
- 0.0.3.10
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.10
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 778 is an active NANP area code (North American Numbering Plan).
- Primary area
- Vancouver / Victoria
- Region
- British Columbia
- Country
- Canada
Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.