638

Names of 638

• Cardinal: 638 can be written as Six hundred thirty-eight.

Scientific notation

• Scientific notation: 6.38 × 10²

Factors of 638

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 42

Divisors of 638

• Number of divisors d(n): 8
• Complete list of divisors:
  1 2 11 22 29 58 319 638
• Sum of all divisors σ(n): 1080
• Sum of proper divisors (its aliquot sum) s(n): 442
• 638 is a deficient number, because the sum of its proper divisors (442) is less than itself. Its deficiency is 196

Bases of 638

• Binary: 1001111110₂
• Hexadecimal: 0x27E
• Base-36: HQ

Squares and roots of 638

• 638 squared (638²) is 407044
• 638 cubed (638³) is 259694072
• The square root of 638 is 25.2586618805
• The cube root of 638 is 8.6087525819

Scales and comparisons

• 638 seconds is equal to 10 minutes, 38 seconds.
• To count from 1 to 638 would take you about five 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 638 cubic inches would be around 0.7 feet tall.

Recreational maths with 638

• 638 backwards is 836
• The number of decimal digits it has is: 3
• The sum of 638's digits is 17
• More coming soon!