Numbers 780,000s

 page of the Numeropedia - the Special Encyclopedia of Numbers

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781,249

[Math.]  Its odd powers end with 781,249. Its even powers end with 000,001.

 

783,556

[Math.]  A pair of amicable numbers (667964, 783556).

 

786,060

[Math.]  Sum (in degrees) of all internal angles of a 4369-side polygon.

A regular 4369-side polygon is constructible by using only straightedge and compass.

 

787,777

[Math.]  All 4 numbers 777787, 777877, 778777 and 787777 (1 digit off repeated digits) are all prime numbers.