28 Number Properties & Facts

Twenty-Eight

Primality

Prime Factorization of 28
22 × 71
Number of Divisors of 28
6
1, 2, 4, 7, 14, 28
1, 2, 4, 7, 14, 28
Is 28 Prime?
No

Trigonometry

Sine of 28
0.27090578830787
Cosecant: 3.6913201679676
Cosine of 28
-0.96260586631357
Secant: -1.0388467751912
Tangent of 28
-0.28142960456427
Cotangent: -3.5532864481272

Functions

Square of 28
784
28 × 28 = 784
Square Root of 28
5.2915026221292
5.29150262212922 = 28
Natural Logarithm (ln) of 28
3.3322045101752
e3.3322045101752 = 28
Decimal Logarithm (log) of 28
1.4471580313422
101.4471580313422 = 28

Sequences

Is 28 a Fibonacci Number?
No
Is 28 a Bell Number?
No
Is 28 a Catalan Number?
No
Is 28 a Factorial?
No
Is 28 a Perfect Number?
Yes: #2

Translations

How do you say 28 in different languages?
Englishtwenty-eight
españolveintiocho
françaisvingt-huit
Deutschacht­und­zwanzig
Nederlandsacht­en­twintig
русскийдвадцать восемь
українськадвадцять вісім
Tiếng Việthai mươi tám
العربيةثمانية و عشرون
עבריתעשרים ושמונה
हिन्दीअट्ठाईस
中文二十八
日本語二十八
한국어이십팔
češtinadvacet osm
hrvatskidvadeset i osam
slovenčinadvadsať­osem
polskidwadzieścia osiem
Türkçeyirmi sekiz
portuguêsvinte e oito
italianovent­otto
svenskatjugo­åtta
suomikaksi­kymmentä­kahdeksan
norsktjue­åtte
Filipinodalawáng pû’t waló
Melayudua puluh lapan
မြန်မာနှစ်ဆယ်ရှစ်
Indonesiadua puluh delapan
Kiswahiliishirini na nane

Numeric Bases

28 in Binary (Base 2)
0b11100
One's Complement: 00011
Two's Complement: 00100
28 in Octal (Base 8)
034
28 in Hexadecimal (Base 16)
0x1C

Miscellaneous

  • 28 is an even number
  • 28 has 2 Significant Figures
  • The Hamming Weight of 28 is 3
  • 28 is not a Hamming (Regular) Number
  • 28 is a Humble Number
  • 28 is a Polygonal (s < 13) Number: Triangular (7), Hexagonal (4)
  • 28 is a Happy Number
  • 28 is not a Self Describing Number
  • 28 is not a Palindrome
  • 28 is not a Münchhausen Number
  • 28 is not an Eban Number
  • 28 is a Pernicious Number
  • 28 is an Attractive Number
  • 28 is not a Perfect Square
  • 28 is not a Perfect Power