10645
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 12780
- Proper Divisor Sum (Aliquot Sum)
- 2135
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 8512
- Möbius Function
- 1
- Radical
- 10645
- 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
- 55
- 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) = floor( n*(n-1)*(n-2)/27 ).at n=67A011909
- Numbers whose base-4 representation contains exactly four 1's and three 2's.at n=33A045108
- Nonnegative numbers of the form n^3 (+/-) 3, n >= 0.at n=42A052276
- Interprimes which are of the form s*prime, s=5.at n=24A075280
- Positions of 9 in partition of decimal expansion of Pi A104807.at n=37A104809
- Numbers k such that the k-th triangular number contains only digits {3,5,6}.at n=15A119187
- Partial sums of orders of finite perfect groups (A060793).at n=14A121513
- a(n) = Sum {j=1..n} j*A001462(j).at n=45A143125
- The number of subsets X of Zn such that for all u, v in X, u+v is not in X.at n=23A206702
- Number of Dyck n-paths all of whose ascents and descents have lengths equal to 1 (mod 7).at n=29A212366
- Five-digit odd semiprimes with all digits distinct.at n=33A247948
- Subword complexity of a the infinite word Prod_{i>=1} Prod_{j=1..i} a^j b^(i-j+1).at n=40A338761
- G.f. satisfies A(x) = 1 + x*A(x) / (1 - x^2*A(x)^4).at n=10A365692