128867385920

Names of 128867385920

• Cardinal: 128867385920 can be written as One hundred twenty-eight billion, eight hundred sixty-seven million, three hundred eighty-five thousand, nine hundred twenty.

Scientific notation

• Scientific notation: 1.2886738592 × 10¹¹

Factors of 128867385920

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 4425418

Divisors of 128867385920

• Number of divisors d(n): 112
• Complete list of divisors:
  1 2 4 5 7 8 10 13 14 16 20 26 28 32 35 40 52 56 64 65 70 80 91 104 112 130 140 160 182 208 224 260 280 320 364 416 448 455 520 560 728 832 910 1040 1120 1456 1820 2080 2240 2912 3640 4160 5824 7280 14560 29120 4425391 8850782 17701564 22126955 30977737 35403128 44253910 57530083 61955474 70806256 88507820 115060166 123910948 141612512 154888685 177015640 230120332 247821896 283225024 287650415 309777370 354031280 402710581 460240664 495643792 575300830 619554740 708062560 805421162 920481328 991287584 1150601660 1239109480 1416125120 1610842324 1840962656 1982575168 2013552905 2301203320 2478218960 3221684648 3681925312 4027105810 4602406640 4956437920 6443369296 8054211620 9204813280 9912875840 12886738592 16108423240 18409626560 25773477184 32216846480 64433692960 128867385920
• Sum of all divisors σ(n): 377680654848
• Sum of proper divisors (its aliquot sum) s(n): 248813268928
• 128867385920 is an abundant number, because the sum of its proper divisors (248813268928) is greater than itself. Its abundance is 119945883008

Bases of 128867385920

• Binary: 1111000000001000110000100001001000000₂
• Hexadecimal: 0x1E01184240
• Base-36: 1N78BBCW

Squares and roots of 128867385920

• 128867385920 squared (128867385920²) is 16606803153854214246400
• 128867385920 cubed (128867385920³) is 2140075310925204162709190770688000
• The square root of 128867385920 is 358981.0383850379
• The cube root of 128867385920 is 5051.0423090519

Scales and comparisons

• 128,867,385,920 seconds is equal to 4,097 years, 30 weeks, 2 days, 16 hours, 5 minutes, 20 seconds.
• To count from 1 to 128,867,385,920 would take you about eight thousand, one hundred ninety-five 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 128867385920 cubic inches would be around 420.9 feet tall.

Recreational maths with 128867385920

• 128867385920 backwards is 029583768821
• The number of decimal digits it has is: 12
• The sum of 128867385920's digits is 59
• More coming soon!