81397988 is an even 8-digits composite number following 81397987
and preceding 81397989 . In scientific notation, it is written as 8.1397988 × 10^7.
The sum of its digits is 53. It has a total of 5 prime factors and 24 positive divisors.
There are 34841664 positive integers (up to 81397988) that are relatively prime to 81397988.
81397988 has 24 divisors, whose sum is 162997632
The reverse of 81397988 is 88979318
Previous prime number is 1223
Is Prime? no Number parity even Number length 8 Sum of Digits 53 Digital Root 8
Name
eighty-one million three hundred ninety-seven thousand nine hundred eighty-eight
Scientific notation
8.1397988 × 10^7
Engineering notation
8.1397988 × 10^6
Prime Factorization
2 × 2 × 7 × 1223 × 2377
Composite number
ω Distinct Factors
4 Total number of distinct prime factors
Ω Total Factors
5 Total number of prime factors
rad Radical
40698994 Product of the distinct prime numbers
The prime factorization of 81397988 is 2 × 2 × 7 × 1223 × 2377.
Since it has a total of 5 prime factors.
9 , 7 , 72 , 6 , 992 , 389 , 1189 , 5785 , 27064 , 77757 , 217053 , 362054 , 9968782 , 8395554 , 91636472 , 96079377 , 247648195 , 689822898 , 5764267160 , 7920500205
n×2
162795976
n×3
244193964
n×4
325591952
n×5
406989940
n÷2
40698994
n÷3
27132662.666667
n÷3
20349497
n÷5
16279597.6
n2
6625632450448144
n3
5.3931315069399E+23
n4
4.3899005368431E+31
n5
3.5732907121915E+39
2 √n9022.0833514217
3 √n433.38235316591
4 √n94.984647977564
5 √n38.205222565594
1 , 2 , 4 , 7 , 14 , 28 , 1223 , 2377 , 2446 , 4754 , 4892 , 8561 , 9508 , 16639 , 17122 , 33278 , 34244 , 66556 , 2907071 , 5814142 , 11628284 , 20349497 , 40698994 , 81397988
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
-81397987 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 81397988 can be divided by 24 positive divisors.
The sum of these divisors (counting 81397988) is 1, the average is 0.041666666666667.
Base
System
Value
2
Binary
100110110100000100011100100
3
Ternary
12200011110001022
4
Quaternary
10312200203210
5
Quinary
131314213423
6
Senary
12024350312
8
Octal
466404344
10
Decimal
81397988
12
Duodecimal
23315398
16
Hexadecimal
4da08e4
20
Vigesimal
158eej8
36
Base36
1cgn38
md5
4e1c28bb638bef578bb72719ed921b49
sha1
f3363a121497c9a82936a45705b954b7fd56e81f
sha256
b95c137abcd31ffb3e5e1c11cead9b2fcdd6b3b6c08c995913ecbc51c2ab25ce
sha512
b5393316b7bc48f079adc3c9231b4256932d0ab1586c67bad65569e561774328a6965d3bb815e1269f4ac378435b0e24fb23663cc4ef1dcfe351022058f6dcb6
ripemd-160
8363929864436a41d824dfdae44dc3d57de6071f
Diameter
162795976
Circumference
511438642.23558
Area
2.0815038231714E+16
Volume
2.2590696429395E+24
Surface area
8.3260152926856E+16
Circumference
511438642.23558
Perimeter
325591952
Area
6625632450448144
Diagonal
115114138.57948
Surface area
39753794702688864
Volume
5.3931315069399E+23
Space diagonal
140985450.84988
Perimeter
244193964
Area
2.8689830091133E+15
Altitude
70492725.424941
Surface area
2.8689830091133E+15
Volume
6.35586643398E+22
Height
38371379.526494