Live analysis

28,008

28,008 is a composite number, even.

This number doesn't have a permanent NumberWiki page yet — what you see below is computed live. Pages get added to the permanent index when they're notable (years, primes, curated, etc.).

28,008 (twenty-eight thousand eight) is an even 5-digit number. It is a composite number with 24 divisors, and factors as 2³ × 3² × 389. Its proper divisors sum to 48,042, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x6D68.

Abundant Number Evil Number Harshad / Niven Recamán's Sequence Refactorable Number Semiperfect Number

Interestingness

★ ★ ☆ ☆ ☆

4 notable facts · grade D

27,996 27,997 27,998 27,999 28,000 28,001 28,002 28,003 28,004 28,005 28,006 28,007 28,008 28,009 28,010 28,011 28,012 28,013 28,014 28,015 28,016 28,017 28,018 28,019 28,020

less more

Properties

Parity: Even
Digit count: 5
Digit sum: 18
Digit product: 0
Digital root: 9
Palindrome: No
Bit width: 15 bits
Reversed: 80,082
Recamán's sequence: a(34,415) = 28,008
Square (n²): 784,448,064
Cube (n³): 21,970,821,376,512
Divisor count: 24
σ(n) — sum of divisors: 76,050
φ(n) — Euler's totient: 9,312
Sum of prime factors: 401

Primality

Prime factorization: 2 ³ × 3 ² × 389

Nearest primes: 28,001 (−7) · 28,019 (+11)

Divisors & multiples

All divisors (24)

1 · 2 · 3 · 4 · 6 · 8 · 9 · 12 · 18 · 24 · 36 · 72 · 389 · 778 · 1167 · 1556 · 2334 · 3112 · 3501 · 4668 · 7002 · 9336 · 14004 (half) · 28008

Aliquot sum (sum of proper divisors): 48,042

Factor pairs (a × b = 28,008)

1 × 28008

2 × 14004

3 × 9336

4 × 7002

6 × 4668

8 × 3501

9 × 3112

12 × 2334

18 × 1556

24 × 1167

36 × 778

72 × 389

First multiples

28,008 · 56,016 (double) · 84,024 · 112,032 · 140,040 · 168,048 · 196,056 · 224,064 · 252,072 · 280,080

Sums & aliquot sequence

As a sum of two squares: 42² + 162²

As consecutive integers: 9,335 + 9,336 + 9,337 3,108 + 3,109 + … + 3,116 1,743 + 1,744 + … + 1,758 560 + 561 + … + 607

Aliquot sequence: 28,008 → 48,042 → 62,874 → 93,126 → 124,602 → 137,958 → 137,970 → 288,270 → 461,466 → 571,878 → 667,230 → 1,005,474 → 1,024,638 → 1,024,650 → 2,216,214 → 4,557,546 → 7,116,534 — unresolved within range

Continued fraction of √n

√28,008 = [167; (2, 1, 4, 3, 1, 11, 5, 4, 2, 1, 1, 2, 1, 6, 9, 6, 1, 2, 1, 1, 2, 4, 5, 11, …)]

Period length 30 — the block in parentheses repeats forever.

Representations

In words: twenty-eight thousand eight
Ordinal: 28008th
Binary: 110110101101000
Octal: 66550
Hexadecimal: 0x6D68
Base64: bWg=
One's complement: 37,527 (16-bit)
Scientific notation: 2.8008 × 10⁴
As a duration: 28,008 s = 7 hours, 46 minutes, 48 seconds

In other bases

ternary (3) 1102102100

quaternary (4) 12311220

quinary (5) 1344013

senary (6) 333400

septenary (7) 144441

nonary (9) 42370

undecimal (11) 1a052

duodecimal (12) 14260

tridecimal (13) c996

tetradecimal (14) a2c8

pentadecimal (15) 8473

Palindromic in base 7

As an angle

28,008° = 77 × 360° + 288°

288° ≈ 5.027 rad

Compass bearing: WNW (west-northwest)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ͵κηηʹ
Mayan (base 20): 𝋣·𝋪·𝋠·𝋨
Chinese: 二萬八千零八
Chinese (financial): 貳萬捌仟零捌

In other modern scripts

Eastern Arabic ٢٨٠٠٨ Devanagari २८००८ Bengali ২৮০০৮ Tamil ௨௮௦௦௮ Thai ๒๘๐๐๘ Tibetan ༢༨༠༠༨ Khmer ២៨០០៨ Lao ໒໘໐໐໘ Burmese ၂၈၀၀၈

Digit at this position in famous constants

π — Pi (π): Digit 28,008 = 8
e — Euler's number (e): Digit 28,008 = 3
φ — Golden ratio (φ): Digit 28,008 = 9
√2 — Pythagoras's (√2): Digit 28,008 = 0
ln 2 — Natural log of 2: Digit 28,008 = 6
γ — Euler-Mascheroni (γ): Digit 28,008 = 9

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 28008, here are decompositions:

7 + 28001 = 28008
11 + 27997 = 28008
41 + 27967 = 28008
47 + 27961 = 28008
61 + 27947 = 28008
67 + 27941 = 28008
89 + 27919 = 28008
107 + 27901 = 28008

Showing the first eight; more decompositions exist.

Unicode codepoint

浨

CJK Unified Ideograph-6D68

U+6D68

Other letter (Lo)

UTF-8 encoding: E6 B5 A8 (3 bytes).

Lookup U+6D68 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#006D68

RGB(0, 109, 104)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.109.104.

Address: 0.0.109.104
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.109.104

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

Position in π

The digit sequence 28008 first appears in π at position 63,497 of the decimal expansion (the 63,497ordinal-suffix:th digit after the integer 3).

Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.

Look up 28008 on Pi Search ↗