Number Gossip

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Unique Properties of 285

  • 285 is the sum of squares of all single-digit numbers
  • 285 is the smallest number whose sum of triangular divisors is its nontrivial divisor
  • 285 is the smallest number which is the product of its largest triangular proper divisor and the sum of its triangular proper divisors: 285 = 15(1+3+15)

Common Properties of 285

Apocalyptic power
Composite
Deficient
Lucky
Odd
Odious
Square-free