8587
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 28
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 8896
- Proper Divisor Sum (Aliquot Sum)
- 309
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8280
- Möbius Function
- 1
- Radical
- 8587
- Omega Function (Ω)
- 2
- Little Omega Function (ω)
- 2
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 127
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- Squarefree Number
- yes
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- a(n) = n*(9*n-2).at n=31A013656
- Numbers k such that 249*2^k+1 is prime.at n=39A032501
- Numbers ending with '7' that are the difference of two positive cubes.at n=40A038862
- Number of partitions satisfying cn(1,5) < cn(0,5) + cn(2,5) + cn(3,5) and cn(4,5) < cn(0,5) + cn(2,5) + cn(3,5).at n=35A039872
- Numbers whose base-5 representation contains exactly three 2's and three 3's.at n=9A045277
- Numbers that are the sum of two (possibly negative) cubes in at least 2 ways.at n=29A051347
- Semiprimes that are the sum of two positive cubes. Common terms of A003325 and A046315.at n=34A085366
- Numbers which are the sum of two positive cubes and divisible by 31.at n=14A102658
- Semiprimes in A003215.at n=21A113530
- Digit sum of Fibonacci primes.at n=24A139537
- a(n) = 12*n^2 + 18*n + 7.at n=26A154105
- Cuban composites: composite numbers equal to the difference of two consecutive cubes.at n=25A159961
- Numbers k such that 6*k + 7 = p^2 (p=prime).at n=46A171140
- Numbers k that are the products of two distinct primes such that 2*k-1, 4*k-3, 8*k-7 and 16*k-15 are also products of two distinct primes.at n=35A177213
- Numbers k that are the products of two distinct primes such that 2*k-1, 4*k-3, 8*k-7, 16*k-15 and 32*k-31 are also products of two distinct primes.at n=12A177214
- a(n)=(A210686(n)-1)/30.at n=43A181903
- Augmentation of the triangular array |A123191|. See Comments.at n=33A193559
- Numbers that are both a sum and a difference of two positive cubes.at n=23A225908
- Numbers that are both a sum of two positive cubes and a difference of two consecutive cubes.at n=4A225909
- Values of n such that L(12) and N(12) are both prime, where L(k) = (n^2+n+1)*2^(2*k) + (2*n+1)*2^k + 1, N(k) = (n^2+n+1)*2^k + n.at n=23A227515