81387989 is an odd 8-digits composite number following 81387988
and preceding 81387990 . In scientific notation, it is written as 8.1387989 × 10^7.
The sum of its digits is 53. It has a total of 3 prime factors and 8 positive divisors.
There are 78356880 positive integers (up to 81387989) that are relatively prime to 81387989.
81387989 has 8 divisors, whose sum is 84446208
The reverse of 81387989 is 98978318
Previous prime number is 197
Is Prime? no Number parity odd Number length 8 Sum of Digits 53 Digital Root 8
Name
eighty-one million three hundred eighty-seven thousand nine hundred eighty-nine
Scientific notation
8.1387989 × 10^7
Engineering notation
8.1387989 × 10^6
Prime Factorization
31 × 197 × 13327
Composite number
ω Distinct Factors
3 Total number of distinct prime factors
Ω Total Factors
3 Total number of prime factors
rad Radical
81387989 Product of the distinct prime numbers
The prime factorization of 81387989 is 31 × 197 × 13327.
Since it has a total of 3 prime factors.
5 , 7 , 43 , 95 , 47 , 384 , 3371 , 379 , 99875 , 70320 , 615936 , 691878 , 6768494 , 1830873 , 63825290 , 54074338 , 876630018 , 324039639 , 6238883579 , 9574163578
n×2
162775978
n×3
244163967
n×4
325551956
n×5
406939945
n÷2
40693994.5
n÷3
27129329.666667
n÷3
20346997.25
n÷5
16277597.8
n2
6624004753464121
n3
5.3911442601089E+23
n4
4.3877438973915E+31
n5
3.5710965205572E+39
2 √n9021.5291941001
3 √n433.36460675019
4 √n94.981730843884
5 √n38.204283886883
8 divisors
τ Total Divisors
8 Total number of the positive divisors of n
σ Sum of Divisors
1 Sum of all the positive divisors of n
s Aliquot Sum
-81387988 Sum of the proper positive divisors of n
A Arithmetic Mean
0.125 Returns the sum of divisors (σ(n )) divided by the total number of divisors (τ(n ))
G Geometric Mean
1 Returns the nth root of the product of n divisors
H Harmonic Mean
8 Returns the total number of divisors (τ(n )) divided by the sum of the reciprocal of each divisors
The number 81387989 can be divided by 8 positive divisors.
The sum of these divisors (counting 81387989) is 1, the average is 0.125.
Base
System
Value
2
Binary
100110110011110000111010101
3
Ternary
12200010221022222
4
Quaternary
10312132013111
5
Quinary
131313403424
6
Senary
12024232125
8
Octal
466360725
10
Decimal
81387989
12
Duodecimal
2330b645
16
Hexadecimal
4d9e1d5
20
Vigesimal
158d9j9
36
Base36
1cgfdh
md5
98b1bb8d1cbfedd91f94451a140a8e45
sha1
76a0e83ccb5a86becd6863923d5092e131603e4a
sha256
a1ec42b9e2aa5d89c1fae28b6878375598aab6e986cb3e19292c04f1a0dfdfb3
sha512
f381ad7bfe3b6471d6fe4885cddd3caba57eeb711ac5df7df2f2066bcb52fc06e0eaa1b270a13031617918c86eb200d991606cb1f12c03304bdf48c92afa8fe1
ripemd-160
f73bafa3b4c1a16047487b65ccbbec339e9f3550
Diameter
162775978
Circumference
511375816.66569
Area
2.0809924670827E+16
Volume
2.2582372269334E+24
Surface area
8.3239698683307E+16
Circumference
511375816.66569
Perimeter
325551956
Area
6624004753464121
Diagonal
115099997.85807
Surface area
39744028520784726
Volume
5.3911442601089E+23
Space diagonal
140968132.07386
Perimeter
244163967
Area
2.8682781956444E+15
Altitude
70484066.036928
Surface area
2.8682781956444E+15
Volume
6.3535244411298E+22
Height
38366665.952691