八次方數(英文:Eighth power number)係喺算術同代數入面,寫得成嘅數,其中一定係整數,即: n8 = n × n × n × n × n × n × n × n.
頭幾個 八次方數(OEIS數列A001016)係:0, 1, 256, 6561, 65536, 390625, 1679616, 5764801, 16777216, 43046721, 100000000, 214358881, 429981696, 815730721, 1475789056, 2562890625, 4294967296, 6975757441, 11019960576, 16983563041, 25600000000, 37822859361, 54875873536, 78310985281, 110075314176, ...