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The 640 equal divisions divides the octave into 640 equal parts of precisely 1.875 cents each. It is contorted in the 5-limit, tempering out the vishnuzma, |23 6 -14>, with the same tuning as 320edo. In the 7-limit it tempers out 19683/19600 and | 16 2 -1 -6 > and in the 11-limit it tempers out 540/539, 8019/8000 and | 14 -1 -2 -4 1 >. It provides the optimal patent val for the rank three albus temperament tempering out 540/539 and 8019/8000, and the 125&130 temperament.