1621128978

Names of 1621128978

• Cardinal: 1621128978 can be written as One billion, six hundred twenty-one million, one hundred twenty-eight thousand, nine hundred seventy-eight.

Scientific notation

• Scientific notation: 1.621128978 × 10⁹

Factors of 1621128978

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 1429579

Divisors of 1621128978

• Number of divisors d(n): 40
• Complete list of divisors:
  1 2 3 6 7 9 14 18 21 27 42 54 63 81 126 162 189 378 567 1134 1429567 2859134 4288701 8577402 10006969 12866103 20013938 25732206 30020907 38598309 60041814 77196618 90062721 115794927 180125442 231589854 270188163 540376326 810564489 1621128978
• Sum of all divisors σ(n): 4151465472
• Sum of proper divisors (its aliquot sum) s(n): 2530336494
• 1621128978 is an abundant number, because the sum of its proper divisors (2530336494) is greater than itself. Its abundance is 909207516

Bases of 1621128978

• Binary: 1100000101000000111011100010010₂
• Hexadecimal: 0x60A07712
• Base-36: QT6F4I

Squares and roots of 1621128978

• 1621128978 squared (1621128978²) is 2628059163311324484
• 1621128978 cubed (1621128978³) is 4260422865542422556573297352
• The square root of 1621128978 is 40263.2459943309
• The cube root of 1621128978 is 1174.7330561233

Scales and comparisons

• 1,621,128,978 seconds is equal to 51 years, 28 weeks, 3 days, 1 hour, 36 minutes, 18 seconds.
• To count from 1 to 1,621,128,978 would take you about one hundred three years!

  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 1621128978 cubic inches would be around 97.9 feet tall.

Recreational maths with 1621128978

• 1621128978 backwards is 8798211261
• The number of decimal digits it has is: 10
• The sum of 1621128978's digits is 45
• More coming soon!