643991

Names of 643991

• Cardinal: 643991 can be written as Six hundred forty-three thousand, nine hundred ninety-one.

Scientific notation

• Scientific notation: 6.43991 × 10⁵

Factors of 643991

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 643991

Divisors of 643991

• Number of divisors d(n): 2
• Complete list of divisors:
  1 643991
• Sum of all divisors σ(n): 643992
• Sum of proper divisors (its aliquot sum) s(n): 1
• 643991 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 643990

Bases of 643991

• Binary: 10011101001110010111₂
• Hexadecimal: 0x9D397
• Base-36: DSWN

Squares and roots of 643991

• 643991 squared (643991²) is 414724408081
• 643991 cubed (643991³) is 267078786284491271
• The square root of 643991 is 802.4904983861
• The cube root of 643991 is 86.3561488011

Scales and comparisons

• 643,991 seconds is equal to 1 week, 10 hours, 53 minutes, 11 seconds.
• To count from 1 to 643,991 would take you about ten hours!

  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 643991 cubic inches would be around 7.2 feet tall.

Recreational maths with 643991

• 643991 backwards is 199346
• The number of decimal digits it has is: 6
• The sum of 643991's digits is 32
• More coming soon!