7646
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 11472
- Proper Divisor Sum (Aliquot Sum)
- 3826
- 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
- 3822
- Möbius Function
- 1
- Radical
- 7646
- 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
- 176
- 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
- yes
- Odd
- no
Appears in sequences
- Pisot sequence E(10,21), a(n) = floor( a(n-1)^2/a(n-2)+1/2 ).at n=9A014007
- Numbers k such that the continued fraction for sqrt(k) has period 88.at n=12A020427
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 86.at n=15A031584
- a(n) = ceiling((n + 7/10)^3).at n=18A034133
- Triangle read by rows giving number of arrangements of k dumbbells on 2 X n grid (n >= 0, k >= 0).at n=59A046741
- Fifth column of A046741.at n=6A062125
- a(n) = Min{x : A073124(x) = 2n}.at n=41A096480
- G.f. A(x) satisfies A(x) = 1 + x*A(x)^4*A(-x)^2.at n=7A143550
- Numbers k such that k, k^2 - 5, and k^2 + 5 are semiprime.at n=35A173085
- Number of nonempty subsets of {1, 2, ..., n} with <=8 pairwise coprime elements.at n=22A187269
- Triangle, read by rows, such that row n equals the coefficients of x^(n^2+n-1+k) in F(x,n) for k = 1..n, where F(x,n) = (1 + x*F(x,n))*(1 + x^n/F(x,n)), for n>=1.at n=51A200171
- G.f.: exp( Sum_{n>=1} (3^n + A(x))^n * x^n/n ).at n=3A202630
- Expansion of series_reversion( x/(1 + sum(k>=1, x^A032766(k)) ) ) / x.at n=11A215340
- Number of closed binary words of length n.at n=16A226452
- Irregular triangle read by rows: T(n,k) is the number of primes with n balanced ternary digits of which 2k+1 (3 <= 2k+1 <= n) are nonzero.at n=28A277514
- Even semiprimes that are the exact average of six consecutive odd semiprimes.at n=37A365202
- Number of subsets of {1..n} containing at least one element that is a sum of distinct non-elements.at n=13A384350