28 (twenty-eight) is the natural number following 27 and preceding 29.
In mathematics
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The number 28 depicted as 28 balls arranged in a triangular pattern with the number of layers of 7
28 as the sum of four nonzero squares.
28 is a composite number, a happy number,[1] and a perfect number.[2]
28 also appears in the Padovan sequence.[3]
In science
References
External links
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400 to 999 |
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- 1023
- 1024
- 1089
- 1093
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- 1234
- 1289
- 1458
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- 1728
- 1729
- 1980
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| 10,000s |
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- 64,079
- 65,535
- 65,536
- 65,537
- 70,000
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100,000s to 10,000,000,000,000s |
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- 1,000,000,000
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