Thursday, June 9, 2011
644
644
= 2
2
x 7 x 23.
644
is a
Perrin number
.
644
is 212212 in base 3 and 2552 in base 6.
644
is a number made up of only semiprime digits (4, 6, and 9).
644
is the sum of five fourth powers:
644
= 5
4
+ 2
4
+ 1
4
+ 1
4
+ 1
4
.
The
USS
Lewis and Clark
(SSBN-
644
) was a ballistic missile submarine in the U.S. Navy.
Source:
What's Special About This Number?
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