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Natural number
87 (eighty-seven ) is the
natural number following
86 and preceding
88 .
In mathematics
87 is:
the sum of the squares of the first four primes (87 = 22 + 32 + 52 + 72 ).
the sum of the sums of the divisors of the first 10
positive integers .
[1]
the thirtieth
semiprime ,
[2] and the twenty-sixth distinct semiprime
[3] and the eighth of the form (3.q).
together with
85 and
86 ,
[4] forms the last semiprime in the 2nd cluster of three consecutive
semiprimes ; the first comprising
33 ,
34 ,
35 .
with an
aliquot sum of
33 ; itself a
semiprime , within an
aliquot sequence of five composite numbers (87,
33 ,
15 ,
9 ,
4 ,
3 ,
1 ,0) to the Prime in the
3 -aliquot tree.
5! - 4! - 3! - 2! - 1! = 87
the last two decimal digits of
Graham's number .
In sports
In other fields
Eighty-seven is also:
The
atomic number of
francium .
An answer to a popular puzzle question states 16, 06, 68, 88, xx, 98. The answer is 87 when looked upside down.
The number of years between the signing of the
U.S. Declaration of Independence and the
Battle of Gettysburg , immortalized in
Abraham Lincoln 's
Gettysburg Address with the phrase "
Four Score and Seven Years ago..."
The model number of
Junkers Ju 87 .
The number of the French department
Haute-Vienne .
The
code for international direct dial phone calls to
Inmarsat and other services.
The 87
photographic filter blocks visible light, allowing only infrared light to pass.
The
ISBN Group Identifier for books published in Denmark.
The opus number of the
24 Preludes and Fugues of
Dmitri Shostakovich .
In
model railroading , the ratio of the popular
H0 scale is 1:87.
[6]
Proto:87 scale claims to offer precise proportions of wheels and tracks of real railroads.
David Bowie CD (1987)
Never Let Me Down includes the song, "
'87 and Cry ".
The
87th United States Congress met from January 3, 1961, to January 3, 1963, during
John F. Kennedy 's time in office.
Ed McBain 's
87th Precinct : Lightning film starred
Randy Quaid (1995).
87 punch includes one bottle of
Bacardi rum (eight years aged) and
7-up (two-liter bottle).
Wenger
Swiss Army Knife version XXL, listed in the
Guinness Book of World Records as the world's most multi-functional
penknife with 87 tools.
Sonnet 87 by
William Shakespeare .
Vault 87 is a main location in the game
Fallout 3 .
M87* is the first black hole ever photographed.
Aragorn 's age in
The Lord of the Rings .
"The Bite of '87" in the
Five Nights at Freddy's series.
See also
100,000
1,000,000
10,000,000
100,000,000
1,000,000,000
References