178
178 is a composite number, even, a calendar year.
178 (one hundred seventy-eight) is an even 3-digit number. It is a composite number with 4 divisors, and factors as 2 × 89. Written other ways, in Roman numerals it is CLXXVIII and in binary, 10110010.
Interestingness
Historical context — 178 AD
Calendar year
Year 178 (CLXXVIII) was a common year starting on Wednesday of the Julian calendar.
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Historical context — 178 BC
Calendar year
Year 178 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
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Thursday
January 1, 178
- Ended on
-
Thursday
December 31, 178
- Friday the 13ths
-
3
3 Friday the 13ths this year.
- Decade
-
170s
170–179
- Century
-
2nd century
101–200
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,848
1848 years before 2026.
In other calendars
- Hebrew
-
3938 / 3939 AM
Rosh Hashanah falls in September/October.
- 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
-
721 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
170 / 171 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
100 / 99 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 89
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√178 = [13; (2, 1, 12, 1, 2, 26)]
Period length 6 — the block in parentheses repeats forever.
Representations
- In words
- one hundred seventy-eight
- Ordinal
- 178th
- Roman numeral
- CLXXVIII
- Binary
- 10110010
- Octal
- 262
- Hexadecimal
- 0xB2
- Base64
- sg==
- One's complement
- 77 (8-bit)
- Scientific notation
- 1.78 × 10²
- As a duration
- 178 s = 2 minutes, 58 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ροηʹ
- Mayan (base 20)
- 𝋨·𝋲
- Chinese
- 一百七十八
- Chinese (financial)
- 壹佰柒拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 178 = 5
- e — Euler's number (e)
- Digit 178 = 3
- φ — Golden ratio (φ)
- Digit 178 = 5
- √2 — Pythagoras's (√2)
- Digit 178 = 5
- ln 2 — Natural log of 2
- Digit 178 = 0
- γ — Euler-Mascheroni (γ)
- Digit 178 = 7
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 178, here are decompositions:
- 5 + 173 = 178
- 11 + 167 = 178
- 29 + 149 = 178
- 41 + 137 = 178
- 47 + 131 = 178
- 71 + 107 = 178
- 89 + 89 = 178
UTF-8 encoding: C2 B2 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.178.
- Address
- 0.0.0.178
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.178
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 178 Hz is closest to:
- Concert pitch (A4 = 440 Hz): F3 (174.6 Hz, +33¢)
- Scientific pitch (C4 = 256 Hz): F♯3 (181 Hz, -29¢)
- Baroque pitch (A4 = 415 Hz): F♯3 (174.5 Hz, +35¢)
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.