Sixty-nine may
also refer to:
The number of
the French
department
Rhône
In Mathematics
sixty-nine is
the twentieth
distinct
biprime
and the seventh
of the form
(3.q). The
aliquot sum
of sixty-nine is
27 within the
aliquot sequence
(69,27,13,1,0)
69 being the
third
composite number
in the
13-aliquot
tree.69 is a
semiprime.
Furthermore,
since the two
factors of 69
are both
Gaussian primes,
69 is a
Blum integer.Adding
up the
divisors
of 1 through 9
gives 69.Because
69 has an odd
number of 1s in
its binary
representation,
it is sometimes
called an "odious
number."
Of note is that
69² (4 761) and
69³ (328 509)
uses every digit
from 0-9. 69 is
equal to
105
octal,
while 105 is
equal to 69
hexadecimal.
This same
property can be
applied to all
numbers from
64
to 69.On many
handheld
scientific and
graphing
calculators,
the highest
factorial
that can be
computed within
memory
limitations is
69! or
1.711224524*1098.The
number 69 can be
rotated 180° and
remain the same.
