Number

578

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

Ascending Digits Deficient Number Odious Number Pernicious Number Recamán's Sequence Year

Historical context — 578 AD

Calendar year

Year 578 (DLXXVIII) was a common year starting on Saturday of the Julian calendar.

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Historical context — 578 BC

Decade

This article concerns the period 579 BC – 570 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: 53
Long year: contains 53 ISO weeks.
Started on: Thursday
January 1, 578
Ended on: Thursday
December 31, 578
Friday the 13ths: 3
3 Friday the 13ths this year.
Decade: 570s
570–579
Century: 6th century
501–600
Millennium: 1st millennium
1–1000
Years ago: 1,448
1448 years before 2026.

In other calendars

Hebrew: 4338 / 4339 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Earth zodiac:Dog
Sexagenary cycle position 35 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1121 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 570 / 571 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 500 / 499 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 20
Digit product: 280
Digital root: 2
Palindrome: No
Bit width: 10 bits
Reversed: 875
Recamán's sequence: a(1,103) = 578
Square (n²): 334,084
Cube (n³): 193,100,552
Divisor count: 6
σ(n) — sum of divisors: 921
φ(n) — Euler's totient: 272
Sum of prime factors: 36

Primality

Prime factorization: 2 × 17 ²

Nearest primes: 577 (−1) · 587 (+9)

Divisors & multiples

All divisors (6)

1 · 2 · 17 · 34 · 289 (half) · 578

Aliquot sum (sum of proper divisors): 343

Factor pairs (a × b = 578)

1 × 578

2 × 289

17 × 34

First multiples

578 · 1,156 (double) · 1,734 · 2,312 · 2,890 · 3,468 · 4,046 · 4,624 · 5,202 · 5,780

Sums & aliquot sequence

As a sum of two squares: 7² + 23² = 17² + 17²

As consecutive integers: 143 + 144 + 145 + 146 26 + 27 + … + 42

Aliquot sequence: 578 → 343 → 57 → 23 → 1 → 0 — terminates at zero

Representations

In words: five hundred seventy-eight
Ordinal: 578th
Roman numeral: DLXXVIII
Binary: 1001000010
Octal: 1102
Hexadecimal: 0x242
Base64: AkI=
One's complement: 64,957 (16-bit)

In other bases

ternary (3) 210102

quaternary (4) 21002

quinary (5) 4303

senary (6) 2402

septenary (7) 1454

nonary (9) 712

undecimal (11) 486

duodecimal (12) 402

tridecimal (13) 356

tetradecimal (14) 2d4

pentadecimal (15) 288

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): φοηʹ
Mayan (base 20): 𝋡·𝋨·𝋲
Chinese: 五百七十八
Chinese (financial): 伍佰柒拾捌

In other modern scripts

Eastern Arabic ٥٧٨ Devanagari ५७८ Bengali ৫৭৮ Tamil ௫௭௮ Thai ๕๗๘ Tibetan ༥༧༨ Khmer ៥៧៨ Lao ໕໗໘ Burmese ၅၇၈

Digit at this position in famous constants

π — Pi (π): Digit 578 = 7
e — Euler's number (e): Digit 578 = 8
φ — Golden ratio (φ): Digit 578 = 6
√2 — Pythagoras's (√2): Digit 578 = 3
ln 2 — Natural log of 2: Digit 578 = 5
γ — Euler-Mascheroni (γ): Digit 578 = 7

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 578, here are decompositions:

7 + 571 = 578
31 + 547 = 578
37 + 541 = 578
79 + 499 = 578
139 + 439 = 578
157 + 421 = 578
181 + 397 = 578
199 + 379 = 578

Showing the first eight; more decompositions exist.

Unicode codepoint

Latin Small Letter Glottal Stop

U+0242

Lowercase letter (Ll)

UTF-8 encoding: C9 82 (2 bytes).

Lookup U+0242 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000242

RGB(0, 2, 66)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.66.

Address: 0.0.2.66
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.66

Unspecified address (0.0.0.0/8) — "this network" placeholder.