81388265 is an odd 8-digits composite number following 81388264
and preceding 81388266 . In scientific notation, it is written as 8.1388265 × 10^7.
The sum of its digits is 41. It has a total of 5 prime factors and 24 positive divisors.
There are 52523520 positive integers (up to 81388265) that are relatively prime to 81388265.
81388265 has 24 divisors, whose sum is 120300552
The reverse of 81388265 is 56288318
Previous prime number is 17
Is Prime? no Number parity odd Number length 8 Sum of Digits 41 Digital Root 5
Name
eighty-one million three hundred eighty-eight thousand two hundred sixty-five
Scientific notation
8.1388265 × 10^7
Engineering notation
8.1388265 × 10^6
Prime Factorization
5 × 7 × 7 × 17 × 19541
Composite number
ω Distinct Factors
4 Total number of distinct prime factors
Ω Total Factors
5 Total number of prime factors
rad Radical
11626895 Product of the distinct prime numbers
The prime factorization of 81388265 is 5 × 7 × 7 × 17 × 19541.
Since it has a total of 5 prime factors.
8 , 6 , 37 , 56 , 50 , 20 , 6036 , 1936 , 74582 , 93381 , 270909 , 894082 , 1510147 , 5492926 , 25691914 , 49909924 , 49009280 , 782251464 , 1794499975 , 9576009635
n×2
162776530
n×3
244164795
n×4
325553060
n×5
406941325
n÷2
40694132.5
n÷3
27129421.666667
n÷3
20347066.25
n÷5
16277653
n2
6624049679710225
n3
5.3911991070542E+23
n4
4.3878034159269E+31
n5
3.5711570718336E+39
2 √n9021.5444908286
3 √n433.36509661976
4 √n94.981811368433
5 √n38.204309798244
1 , 5 , 7 , 17 , 35 , 49 , 85 , 119 , 245 , 595 , 833 , 4165 , 19541 , 97705 , 136787 , 332197 , 683935 , 957509 , 1660985 , 2325379 , 4787545 , 11626895 , 16277653 , 81388265
24 divisors
τ Total Divisors
24 Total number of the positive divisors of n
σ Sum of Divisors
1 Sum of all the positive divisors of n
s Aliquot Sum
-81388264 Sum of the proper positive divisors of n
A Arithmetic Mean
0.041666666666667 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
24 Returns the total number of divisors (τ(n )) divided by the sum of the reciprocal of each divisors
The number 81388265 can be divided by 24 positive divisors.
The sum of these divisors (counting 81388265) is 1, the average is 0.041666666666667.
Base
System
Value
2
Binary
100110110011110001011101001
3
Ternary
12200010221201012
4
Quaternary
10312132023221
5
Quinary
131313411030
6
Senary
12024233305
8
Octal
466361351
10
Decimal
81388265
12
Duodecimal
2330b835
16
Hexadecimal
4d9e2e9
20
Vigesimal
158dad5
36
Base36
1cgfl5
md5
24723090ddb430097025b4a842f82640
sha1
853c90a1c1871a4c3c0a8c48758e3bd96713ea10
sha256
5357f82a2d5981a9bad7d6d41d2c4b0137bd0a192ccd48a102beac3a14365fa7
sha512
292d8431e6e278f9eb1616ae49f4d96191b899e286faac78ac6d8d69a883b7bb7c33387439a078c86912d1b92e3f87a41ac2b92e6499c58324c653777b8920ae
ripemd-160
8bc79860fe71bc7ddba125cb7ea0b667634d8191
Diameter
162776530
Circumference
511377550.82484
Area
2.0810065810791E+16
Volume
2.2582602011682E+24
Surface area
8.3240263243166E+16
Circumference
511377550.82484
Perimeter
325553060
Area
6624049679710225
Diagonal
115100388.18102
Surface area
39744298078261350
Volume
5.3911991070542E+23
Space diagonal
140968610.11988
Perimeter
244164795
Area
2.8682976492796E+15
Altitude
70484305.05994
Surface area
2.8682976492796E+15
Volume
6.3535890788748E+22
Height
38366796.060338