128978887840

Names of 128978887840

• Cardinal: 128978887840 can be written as One hundred twenty-eight billion, nine hundred seventy-eight million, eight hundred eighty-seven thousand, eight hundred forty.

Scientific notation

• Scientific notation: 1.2897888784 × 10¹¹

Factors of 128978887840

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 2095

Divisors of 128978887840

• Number of divisors d(n): 192
• Complete list of divisors:
  1 2 4 5 8 10 11 16 20 22 32 40 44 55 73 80 88 110 146 160 176 220 292 352 365 440 584 730 803 880 991 1013 1168 1460 1606 1760 1982 2026 2336 2920 3212 3964 4015 4052 4955 5065 5840 6424 7928 8030 8104 9910 10130 10901 11143 11680 12848 15856 16060 16208 19820 20260 21802 22286 25696 31712 32120 32416 39640 40520 43604 44572 54505 55715 64240 72343 73949 79280 81040 87208 89144 109010 111430 128480 144686 147898 158560 162080 174416 178288 218020 222860 289372 295796 348832 356576 361715 369745 436040 445720 578744 591592 723430 739490 795773 813439 872080 891440 1003883 1157488 1183184 1446860 1478980 1591546 1626878 1744160 1782880 2007766 2314976 2366368 2893720 2957960 3183092 3253756 3978865 4015532 4067195 5019415 5787440 5915920 6366184 6507512 7957730 8031064 8134390 10038830 11042713 11574880 11831840 12732368 13015024 15915460 16062128 16268780 20077660 22085426 25464736 26030048 31830920 32124256 32537560 40155320 44170852 55213565 63661840 65075120 73283459 80310640 88341704 110427130 127323680 130150240 146566918 160621280 176683408 220854260 293133836 353366816 366417295 441708520 586267672 732834590 806118049 883417040 1172535344 1465669180 1612236098 1766834080 2345070688 2931338360 3224472196 4030590245 5862676720 6448944392 8061180490 11725353440 12897888784 16122360980 25795777568 32244721960 64489443920 128978887840
• Sum of all divisors σ(n): 337640389632
• Sum of proper divisors (its aliquot sum) s(n): 208661501792
• 128978887840 is an abundant number, because the sum of its proper divisors (208661501792) is greater than itself. Its abundance is 79682613952

Bases of 128978887840

• Binary: 1111000000111101111011010010010100000₂
• Hexadecimal: 0x1E07BDA4A0
• Base-36: 1N92P6SG

Squares and roots of 128978887840

• 128978887840 squared (128978887840²) is 16635553508443299865600
• 128978887840 cubed (128978887840³) is 2145635190121826866364709474304000
• The square root of 128978887840 is 359136.3081616783
• The cube root of 128978887840 is 5052.4986862255

Scales and comparisons

• 128,978,887,840 seconds is equal to 4,101 years, 6 weeks, 5 days, 4 hours, 50 minutes, 40 seconds.
• To count from 1 to 128,978,887,840 would take you about eight thousand, two hundred two 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 128978887840 cubic inches would be around 421 feet tall.

Recreational maths with 128978887840

• 128978887840 backwards is 048788879821
• The number of decimal digits it has is: 12
• The sum of 128978887840's digits is 70
• More coming soon!