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The Number 864: Properties and Meanings
is a 289-gonal Number
is the number of partitions of 38 into distinct parts.
"The major Toltec complex of Teotihuacan in Mexico, has its great Pyramid of the Sun with an overall base of 864
STU (Standard Teotihuacan Units) which is twice 432
The Year 864 AD
In the year 864