Complete Number Analysis
28
It's a perfect number!
It's a triangular number!
It's a happy number!
Number Visualizations
Binary Visual
11100
3 ones, 2 zeros
Mathematical Properties
Basic Properties
Parity:
Even
Prime:
No
Square:
784
Cube:
21,952
Square root:
5.2915
Cube root:
3.0366
Divisors and Factors
Prime factors:
2 × 2 × 7
Number of divisors:
6
Sum of divisors:
28
Type:
Perfect
Divisors:
1, 2, 4, 7, 14, 28
Conversions
Binary:
11100
Octal:
34
Hexadecimal:
1C
Roman:
XXVIII
Base64:
Mjg=
Geometry and Measures
Circle (radius 28)
Area:
2,463.01 u²
Perimeter:
175.93 u
Diameter:
56 u
Square (side 28)
Area:
784 u²
Perimeter:
112 u
Diagonal:
39.60 u
3D Volumes
Cubo:
21,952 u³
Sphere:
91,952.32 u³
Cylinder:
68,964.24 u³
More Measures
Eq. triangle:
339.48 u²
Hexagon:
2,036.89 u²
Cube surf.:
4,704 u²
Numerology and Symbolism
Numerological Analysis
Sum of digits:
10
Numerological reduction:
1
Product of digits:
16
Unique Digits:
2
Meanings:
Leadership
Independence
Pioneer
Number Curiosities
General fact: 28 is the number of days the curing time of concrete is classically considered to be.
Mathematical fact: 28 is a harmonic divisor number, a happy number, a triangular number, a hexagonal number, and a centered nonagonal number.
Trivia: 28 is the number worn by the Clemson Tigers' record breaking running back C.J.
Historical date: January 28th is the day in 1821 that Alexander Island is first discovered by Fabian Gottlieb von Bellingshausen.
More Interesting Properties
In the calendar
Day of the year:
28 January
Weeks:
4 weeks
Months:
0.9 months
Years:
0.08 years
In time
Seconds:
00:00:28
Minutes:
0.47 min
Hours:
0.01 h
Days:
0 days
Representations
Percentage:
28%
Angle:
28°
Temperature:
28°C = 82.4°F
Frequency:
28 Hz
Games
Dice (d6):
4 dados + 4
Chess:
d4
Cards:
2♦
Programmatically generated for number 28
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