28 Number Properties & Facts

Twenty-Eight

Primality

Prime Factorization of 28
22 × 71
Number of Divisors in 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

Numeric Bases

28 in Binary
0b11100
Base 2
28 in Octal
034
Base 8
28 in Hexadecimal
0x1C
Base 16

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

Miscellaneous

Number of Significant Figures in 28
2
Hamming Weight of 28
3
Is 28 a Hamming (Regular) Number?
No
Is 28 a Humble Number?
Yes
Is 28 a Polygonal (s < 13) Number?
Triangular (7), Hexagonal (4)
Is 28 a Happy Number?
Yes
Is 28 a Self Describing Number?
No
Is 28 a Palindrome?
No
Is 28 a Münchhausen Number?
No
Is 28 an Eban Number?
No
Is 28 a Pernicious Number?
Yes
Is 28 a Attractive Number?
Yes
Is 28 a Perfect Square?
No
Is 28 a Perfect Power?
No