58
58 is a composite number, even, a calendar year.
58 (fifty-eight) is an even 2-digit number. It is a composite number with 4 divisors, and factors as 2 × 29. Written other ways, in Roman numerals it is LVIII and in binary, 111010.
Interestingness
Historical context — 58 AD
Calendar year
AD 58 (LVIII) was a common year starting on Sunday of the Julian calendar.
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Notable events — 58 BC
- Undated Caesar begins the Gallic Wars.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
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
-
Tuesday
January 1, 58
- Ended on
-
Tuesday
December 31, 58
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
50s
50–59
- Century
-
1st century
1–100
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,968
1968 years before 2026.
In other calendars
- Hebrew
-
3818 / 3819 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
-
601 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
50 / 51 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
-20 / -21 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 × 29
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√58 = [7; (1, 1, 1, 1, 1, 1, 14)]
Period length 7 — the block in parentheses repeats forever.
Representations
- In words
- fifty-eight
- Ordinal
- 58th
- Roman numeral
- LVIII
- Binary
- 111010
- Octal
- 72
- Hexadecimal
- 0x3A
- Base64
- Og==
- One's complement
- 197 (8-bit)
- Scientific notation
- 5.8 × 10¹
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- νηʹ
- Mayan (base 20)
- 𝋢·𝋲
- Chinese
- 五十八
- Chinese (financial)
- 伍拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 58 = 4
- e — Euler's number (e)
- Digit 58 = 6
- φ — Golden ratio (φ)
- Digit 58 = 5
- √2 — Pythagoras's (√2)
- Digit 58 = 6
- ln 2 — Natural log of 2
- Digit 58 = 0
- γ — Euler-Mascheroni (γ)
- Digit 58 = 5
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 58, here are decompositions:
- 5 + 53 = 58
- 11 + 47 = 58
- 17 + 41 = 58
- 29 + 29 = 58
As an ASCII codepoint, 58 is :. Printable ASCII character :.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.58.
- Address
- 0.0.0.58
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.58
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 58 Hz is closest to:
- Concert pitch (A4 = 440 Hz): A♯1 (58.3 Hz, -8¢)
- Scientific pitch (C4 = 256 Hz): A♯1 (57 Hz, +30¢)
- Baroque pitch (A4 = 415 Hz): B1 (58.2 Hz, -7¢)
As a MIDI note number, 58 is A♯3 (233.1 Hz at concert pitch).
On the periodic table, atomic number 58 is Cerium (Ce) — period 6.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.