Numbers 87,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

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872nn

[Zip]  No such U.S. Postal Zip Codes.

 

87,633

[Math.]  A pair of amicable numbers (69615, 87633).

 

87,639

[Math.]  876392 = 7,680,594,321, a square number using each of 10 digits 0-9 once. (The 69th of 87 such numbers).

 

876nn

[Zip]  No such U.S. Postal Zip Codes.

 

87,901

[Trivia]   U.S. Postal Zip Code: Truth or Consequences, New Mexico 87901; Formerly known as Hot Springs, changed its name after the title of a popular radio quiz program.

 

87,912

[Math.] 

(*)   8712 = 2178×4 & 8712×2178 = 18,974,736 = 43562

87128712 = 21782178×4 & 87128712×21782178 = 435643562

 

(**)   87912 = 21978×4 & 21978×87912 = 1,932,129,936 = 439562

87912…87912 = 21978…21978×4 & 21978…21978×87912…87912 = 43956…439562

 

(***)   879912 = 219978×4 & 219978×879912 = 193,561,281,936 = 4399562

879912…879912 = 219978219978×4 &

219978…219978×879912…879912 = 4399564399562

 

(****)   879…912 = 219…978×4 & 219…978×879…912 = 439…9562

879…912…879…912 = 219…978…219…978×4 &

          219...978...219...978×879...912...879...912 = 439...956...439...9562.

 

87,930

[Library]  ISBN-0-87930 is the International Standard Book Number for books published by R & D Books.

 

87nnn

[Zip]  U.S. Postal Zip Codes of New Mexico: 87nnn and 880nn-884nn.