128639680

Names of 128639680

• Cardinal: 128639680 can be written as One hundred twenty-eight million, six hundred thirty-nine thousand, six hundred eighty.

Scientific notation

• Scientific notation: 1.2863968 × 10⁸

Factors of 128639680

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 144

Divisors of 128639680

• Number of divisors d(n): 168
• Complete list of divisors:
  1 2 4 5 8 10 13 16 17 20 26 32 34 40 52 64 65 68 80 85 104 107 130 136 160 170 208 214 221 260 272 289 320 340 416 428 442 520 535 544 578 680 832 856 884 1040 1070 1088 1105 1156 1360 1391 1445 1712 1768 1819 2080 2140 2210 2312 2720 2782 2890 3424 3536 3638 3757 4160 4280 4420 4624 5440 5564 5780 6848 6955 7072 7276 7514 8560 8840 9095 9248 11128 11560 13910 14144 14552 15028 17120 17680 18190 18496 18785 22256 23120 23647 27820 29104 30056 30923 34240 35360 36380 37570 44512 46240 47294 55640 58208 60112 61846 70720 72760 75140 89024 92480 94588 111280 116416 118235 120224 123692 145520 150280 154615 189176 222560 236470 240448 247384 291040 300560 309230 378352 401999 445120 472940 494768 582080 601120 618460 756704 803998 945880 989536 1202240 1236920 1513408 1607996 1891760 1979072 2009995 2473840 3215992 3783520 4019990 4947680 6431984 7567040 8039980 9895360 12863968 16079960 25727936 32159920 64319840 128639680
• Sum of all divisors σ(n): 353708208
• Sum of proper divisors (its aliquot sum) s(n): 225068528
• 128639680 is an abundant number, because the sum of its proper divisors (225068528) is greater than itself. Its abundance is 96428848

Bases of 128639680

• Binary: 111101010101110001011000000₂
• Hexadecimal: 0x7AAE2C0
• Base-36: 24L70G

Squares and roots of 128639680

• 128639680 squared (128639680²) is 16548167270502400
• 128639680 cubed (128639680³) is 2128750942263902175232000
• The square root of 128639680 is 11341.9433960851
• The cube root of 128639680 is 504.8065527077

Scales and comparisons

• 128,639,680 seconds is equal to 4 years, 4 weeks, 4 days, 21 hours, 14 minutes, 40 seconds.
• To count from 1 to 128,639,680 would take you about six 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 128639680 cubic inches would be around 42.1 feet tall.

Recreational maths with 128639680

• 128639680 backwards is 086936821
• The number of decimal digits it has is: 9
• The sum of 128639680's digits is 43
• More coming soon!