2648
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 5
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 4980
- Proper Divisor Sum (Aliquot Sum)
- 2332
- 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
- 1320
- Möbius Function
- 0
- Radical
- 662
- Omega Function (Ω)
- 4
- 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
- 27
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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 plane partitions of n with at most two rows.at n=17A000990
- Number of inequivalent Costas arrays of order n under dihedral group.at n=15A001441
- Number of n-step self-avoiding walks on b.c.c. lattice (version 2).at n=4A001666
- Susceptibility series for b.c.c. lattice.at n=4A002914
- a(n) = 6*n^2 + 2 for n > 0, a(0)=1.at n=21A005897
- Coordination sequence T4 for Zeolite Code AFR.at n=39A008022
- Coordination sequence T9 for Zeolite Code EUO.at n=32A008104
- Coordination sequence T2 for Zeolite Code MEL.at n=33A008151
- Coordination sequence T4 for Zeolite Code SGT.at n=32A008232
- Coordination sequence T1 for Zeolite Code ZON.at n=36A009919
- Coordination sequence for CaF2(2), Ca position.at n=23A009926
- Coordination sequence for NiAs(1), As position.at n=21A009943
- Spontaneous magnetization coefficients for square lattice spin 3/2 Ising model.at n=29A010105
- a(n) = floor(n*(n-1)*(n-2)/30).at n=44A011912
- Numbers k such that phi(k) + 9 | sigma(k + 9).at n=27A015788
- Squares on infinite chessboard at n moves from center using a {2,3} fairy knight.at n=40A018839
- Numbers k such that Fib(k) == 21 (mod k).at n=19A023179
- T(2n,n+2), T given by A026769.at n=5A026884
- Coordination sequence T1 for Zeolite Code SAT.at n=37A027373
- Spontaneous magnetization coefficients for square lattice spin 3/2 Ising model.at n=29A030120