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The second perfect number
28 is the second perfect number: 1+2+4+7+14=28. The first is 6, the next is 496. Perfect numbers are extremely rare; only 51 have been found to date.
Science
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28 days of the lunar cycle
The synodic month — the period of lunar phase change — is approximately 29.5 days, but rounded to 28 days it forms the basis of lunar calendars. The female biological cycle is also close to this number.
Science
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'28 Days Later' — cult horror
Danny Boyle's '28 Days Later' (2002) relaunched the zombie horror genre by introducing the concept of fast-moving infected. Shot on digital camera, which gave it a documentary atmosphere.
Culture