8128

Small list of interesting 4-digit numbers:
 
1061    4-digit prime numbers (all)
1105    various sums of two squares
2520    1st highly composite number
4225    various sums of two squares
5525    various sums of two squares
5777    first of two 'Stern numbers'
5993    second of the Stern numbers
6174    Kaprekar's constant 4-digit
8125    various sums of two squares
8128   ⇐ only 4-digit perfect number


 
collected by
artmetic   monoalgorithmic digital art


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horn_torus  real world ↔ complex numbers