88
88 is a composite number, even, a calendar year.
88 (eighty-eight) is an even 2-digit number. It is a composite number with 8 divisors, and factors as 2³ × 11. Its proper divisors sum to 92, more than the number itself, making it an abundant number. Its digits read the same forwards and backwards, so it is a palindromic number. Written other ways, in Roman numerals it is LXXXVIII and in binary, 1011000.
Interestingness
Historical context — 88 AD
Calendar year
AD 88 (LXXXVIII) was a leap year starting on Tuesday of the Julian calendar.
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Historical context — 88 BC
Calendar year
Year 88 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
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Thursday
January 1, 88
- Ended on
-
Friday
December 31, 88
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
80s
80–89
- Century
-
1st century
1–100
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,938
1938 years before 2026.
In other calendars
- Hebrew
-
3848 / 3849 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
-
631 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
80 / 81 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
10 / 9 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 3 × 11
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√88 = [9; (2, 1, 1, 1, 2, 18)]
Period length 6 — the block in parentheses repeats forever.
Representations
- In words
- eighty-eight
- Ordinal
- 88th
- Roman numeral
- LXXXVIII
- Binary
- 1011000
- Octal
- 130
- Hexadecimal
- 0x58
- Base64
- WA==
- One's complement
- 167 (8-bit)
- Scientific notation
- 8.8 × 10¹
- As a duration
- 88 s = 1 minute, 28 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- πηʹ
- Mayan (base 20)
- 𝋤·𝋨
- Chinese
- 八十八
- Chinese (financial)
- 捌拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 88 = 4
- e — Euler's number (e)
- Digit 88 = 2
- φ — Golden ratio (φ)
- Digit 88 = 7
- √2 — Pythagoras's (√2)
- Digit 88 = 7
- ln 2 — Natural log of 2
- Digit 88 = 3
- γ — Euler-Mascheroni (γ)
- Digit 88 = 7
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 88, here are decompositions:
- 5 + 83 = 88
- 17 + 71 = 88
- 29 + 59 = 88
- 41 + 47 = 88
As an ASCII codepoint, 88 is X. Printable ASCII character X.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.88.
- Address
- 0.0.0.88
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.88
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Matches numbered highway designation:
- I-88 — Two segments: Schenectady, NY and Chicago, IL→Rock Island.
Heard as a frequency, 88 Hz is closest to:
- Concert pitch (A4 = 440 Hz): F2 (87.3 Hz, +14¢)
- Scientific pitch (C4 = 256 Hz): F♯2 (90.5 Hz, -49¢ — about midway to F2)
- Baroque pitch (A4 = 415 Hz): F♯2 (87.2 Hz, +15¢)
As a MIDI note number, 88 is E6 (1318.5 Hz at concert pitch).
On the periodic table, atomic number 88 is Radium (Ra) — period 7.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.