+78 is a [natural number](/wiki/Natural_Number) that follows 77 and precedes 79. It holds significance in [mathematics](/wiki/Mathematics) as a triangular number and is widely recognized for the rotational speed of a historical record format.
+## See also
+- [Number](/wiki/Number)
+- [Triangular Number](/wiki/Triangular_Number)
+- [RPM](/wiki/RPM)
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