285 (number)

Last updated
284 285 286
Cardinal two hundred eighty-five
Ordinal 285th
(two hundred eighty-fifth)
Factorization 3 × 5 × 19
Divisors 1, 3, 5, 15, 19, 57, 95, 285
Greek numeral ΣΠΕ´
Roman numeral CCLXXXV, cclxxxv
Binary 1000111012
Ternary 1011203
Senary 11536
Octal 4358
Duodecimal 1B912
Hexadecimal 11D16

285 is the natural number following 284 and preceding 286.

In mathematics

References

  1. "Composite numbers". mathworld.wolfram.com.
  2. "Square pyramidal number sequence". marhworld.wolfram.com.
  3. "Binary rooted tree". mathworld.wolfram.com.
  4. Sloane, N. J. A. (ed.). "SequenceA007304(sphenic numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  5. "Sphenic numbers". mathworld.wolfram.com.
  6. "Harshad numbers". mathworld.wolfram.com.
  7. "Repdigit numbers". mathworld.wolfram.com.
  8. Sloane, N. J. A. (ed.). "SequenceA053701(Vertically symmetric numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.