428

Names of 428

• Cardinal: 428 can be written as Four hundred twenty-eight.

Scientific notation

• Scientific notation: 4.28 × 10²

Factors of 428

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 109

Divisors of 428

• Number of divisors d(n): 6
• Complete list of divisors:
  1 2 4 107 214 428
• Sum of all divisors σ(n): 756
• Sum of proper divisors (its aliquot sum) s(n): 328
• 428 is a deficient number, because the sum of its proper divisors (328) is less than itself. Its deficiency is 100

Bases of 428

• Binary: 110101100₂
• Hexadecimal: 0x1AC
• Base-36: BW

Squares and roots of 428

• 428 squared (428²) is 183184
• 428 cubed (428³) is 78402752
• The square root of 428 is 20.6881608655
• The cube root of 428 is 7.5361220433

Scales and comparisons

• 428 seconds is equal to 7 minutes, 8 seconds.
• To count from 1 to 428 would take you about three minutes.

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 428 cubic inches would be around 0.6 feet tall.

Recreational maths with 428

• 428 backwards is 824
• The number of decimal digits it has is: 3
• The sum of 428's digits is 14
• More coming soon!