6778
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
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 10170
- Proper Divisor Sum (Aliquot Sum)
- 3392
- 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
- 3388
- Möbius Function
- 1
- Radical
- 6778
- 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
- 36
- 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
- Number of points on surface of truncated tetrahedron: a(n) = 14*n^2 + 2 for n > 0, a(0)=1.at n=22A005905
- Numbers k such that the continued fraction for sqrt(k) has period 31.at n=26A020370
- Numbers k such that k^2 is palindromic in base 3.at n=38A029984
- "AFK" (ordered, size, unlabeled) transform of 2,2,2,2,...at n=15A032005
- Maximal number of 132 patterns in a permutation of 1,2,...,n.at n=44A061061
- a(n) is the smallest value of m such that prod(m) = n*length(m)*sum(m) where prod(m) is the product of the digits of m, length(m) is the number of digits of m, sum(m) is the sum of the digits of m; or 0 if no such m exists.at n=20A064022
- Sum of the aliquot divisors of n-th Fibonacci number.at n=20A074283
- Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=1, r=5, I={1,2}.at n=22A079963
- Number of monocyclic skeletons with n carbon atoms and a ring size of 6.at n=9A120779
- Antidiagonal sums of the array A051776.at n=43A141395
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 1, 1), (0, 0, 1), (1, -1, 1), (1, 1, 0)}.at n=7A150263
- Triangle read by rows: a(1,1) = 1. a(m,m) = sum of all terms in rows 1 through m-1. a(m,n) = a(m-1,n) + (sum of all terms in rows 1 through m-1), for n < m.at n=24A159927
- A126789 with zeros removed.at n=41A176623
- Number of n X 1 0..4 arrays with values 0..4 introduced in row major order and each element equal to one or two horizontal and vertical neighbors.at n=14A198662
- a(n) = floor(Fibonacci(n)^(1/4)).at n=75A199575
- Number of distinct lines passing through 3 or more points in an n X n grid.at n=20A225606
- Number of length n+4 0..5 arrays with every five consecutive terms having four times some element equal to the sum of the remaining four.at n=11A249653
- Positions of 2's in A264977; positions of 3's in A277330.at n=34A277712
- Sum of cubes of nonprime divisors of n.at n=17A279290
- Expansion of Product_{k>=1} ((1 + x^k)/(1 - x^k))^(2^(k-1)).at n=9A304962