28 is the non-cubic number
The others work out like this -
2x2x2=8
4x4x4=64
5x5x5=125
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125 64 = 4³ 125 = 5³
Since 64 is 4³, the next cube number is 5³ = 125.
13 ...23 ...33 ...43 ...53=125■
13 = 123 = 833 = 2743 = 6453 = 1251, 8, 27, 64 and 125.
1 8 27 64 125 216 343 512 729 1000