19 20 21 22 23 24 25 26 27 28 29 30
| |||
Glavni števnik | osemindvajset | ||
Vrstilni števnik | osemindvajseti | ||
Razcep | |||
Rimska številka | XXVIII | ||
Dvojiško | 11100 | ||
Šestnajstiško | 1C | ||
Matematične lastnosti | |||
---|---|---|---|
φ(28) = 12 | |||
τ(28) = 6 {1, 2, 4, 7, 14, 28} | |||
σ(28) = 56 | |||
π(28) = 9 | |||
μ(28) = 0 | |||
M(28) = -1 |
28 (ósemindvájset) je naravno število, za katero velja 28 = 27 + 1 = 29 - 1.
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