Number

58

58 is a composite number, even, a calendar year.

Deficient Number Evil Number Recamán's Sequence Semiprime Smith Number Squarefree Year

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

Parity: Even
Digit count: 2
Digit sum: 13
Digit product: 40
Digital root: 4
Palindrome: No
Bit width: 6 bits
Reversed: 85
Recamán's sequence: a(200) = 58
Square (n²): 3,364
Cube (n³): 195,112
Divisor count: 4
σ(n) — sum of divisors: 90
φ(n) — Euler's totient: 28
Sum of prime factors: 31

Primality

Prime factorization: 2 × 29

Nearest primes: 53 (−5) · 59 (+1)

Divisors & multiples

All divisors (4)

1 · 2 · 29 (half) · 58

Aliquot sum (sum of proper divisors): 32

Factor pairs (a × b = 58)

1 × 58

2 × 29

First multiples

58 · 116 (double) · 174 · 232 · 290 · 348 · 406 · 464 · 522 · 580

Sums & aliquot sequence

As a sum of two squares: 3² + 7²

As consecutive integers: 13 + 14 + 15 + 16

Aliquot sequence: 58 → 32 → 31 → 1 → 0 — terminates at zero

Representations

In words: fifty-eight
Ordinal: 58th
Roman numeral: LVIII
Binary: 111010
Octal: 72
Hexadecimal: 0x3A
Base64: Og==
One's complement: 197 (8-bit)

In other bases

ternary (3) 2011

quaternary (4) 322

quinary (5) 213

senary (6) 134

septenary (7) 112

nonary (9) 64

undecimal (11) 53

duodecimal (12) 4a

tridecimal (13) 46

tetradecimal (14) 42

pentadecimal (15) 3d

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

In other modern scripts

Eastern Arabic ٥٨ Devanagari ५८ Bengali ৫৮ Tamil ௫௮ Thai ๕๘ Tibetan ༥༨ Khmer ៥៨ Lao ໕໘ Burmese ၅၈

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 decomposition

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

ASCII character

As an ASCII codepoint, 58 is :. Printable ASCII character :.

Hex color

#00003A

RGB(0, 0, 58)

IPv4 address

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.