138138979720

Names of 138138979720

• Cardinal: 138138979720 can be written as One hundred thirty-eight billion, one hundred thirty-eight million, nine hundred seventy-nine thousand, seven hundred twenty.

Scientific notation

• Scientific notation: 1.3813897972 × 10¹¹

Factors of 138138979720

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 201575

Divisors of 138138979720

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 4 5 7 8 10 14 20 28 31 35 40 56 62 70 79 124 140 155 158 217 248 280 310 316 395 434 553 620 632 790 868 1085 1106 1240 1580 1736 2170 2212 2449 2765 3160 4340 4424 4898 5530 8680 9796 11060 12245 17143 19592 22120 24490 34286 48980 68572 85715 97960 137144 171430 201451 342860 402902 685720 805804 1007255 1410157 1611608 2014510 2820314 4029020 5640628 6244981 7050785 8058040 11281256 12489962 14101570 15914629 24979924 28203140 31224905 31829258 43714867 49959848 56406280 62449810 63658516 79573145 87429734 111402403 124899620 127317032 159146290 174859468 218574335 222804806 249799240 318292580 349718936 437148670 445609612 493353499 557012015 636585160 874297340 891219224 986706998 1114024030 1748594680 1973413996 2228048060 2466767495 3453474493 3946827992 4456096120 4933534990 6906948986 9867069980 13813897972 17267372465 19734139960 27627795944 34534744930 69069489860 138138979720
• Sum of all divisors σ(n): 371316326400
• Sum of proper divisors (its aliquot sum) s(n): 233177346680
• 138138979720 is an abundant number, because the sum of its proper divisors (233177346680) is greater than itself. Its abundance is 95038366960

Bases of 138138979720

• Binary: 10000000101001101110011000110110001000₂
• Hexadecimal: 0x2029B98D88
• Base-36: 1RGKDQX4

Squares and roots of 138138979720

• 138138979720 squared (138138979720²) is 19082377718082571278400
• 138138979720 cubed (138138979720³) is 2636020188607588191112352074048000
• The square root of 138138979720 is 371670.5257617289
• The cube root of 138138979720 is 5169.3834491797

Scales and comparisons

• 138,138,979,720 seconds is equal to 4,392 years, 20 weeks, 2 days, 18 hours, 48 minutes, 40 seconds.
• To count from 1 to 138,138,979,720 would take you about eight thousand, seven hundred eighty-four 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 138138979720 cubic inches would be around 430.8 feet tall.

Recreational maths with 138138979720

• 138138979720 backwards is 027979831831
• The number of decimal digits it has is: 12
• The sum of 138138979720's digits is 58
• More coming soon!