2878
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4320
- Proper Divisor Sum (Aliquot Sum)
- 1442
- 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
- 1438
- Möbius Function
- 1
- Radical
- 2878
- 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
- 128
- 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 numbers of complexity n, i.e., that can be built from n ones using + and *, and require at least that many ones.at n=27A005421
- Number of Twopins positions.at n=13A005682
- Coordination sequence T3 for Zeolite Code BOG.at n=38A008051
- Coordination sequence T3 for Zeolite Code DOH.at n=33A008080
- Coordination sequence T5 for Zeolite Code HEU.at n=35A008120
- Coordination sequence T6 for Zeolite Code MFI.at n=34A008169
- Coordination sequence T1 for Zeolite Code NAT.at n=36A008203
- Coordination sequence T2 for Zeolite Code NAT.at n=36A008204
- Numbers k such that sigma(k) = sigma(k+11).at n=7A015881
- Powers of fourth root of 3 rounded down.at n=29A018051
- Powers of fourth root of 3 rounded to nearest integer.at n=29A018052
- Expansion of 1/((1-x)*(1-5x)*(1-6x)*(1-8x)).at n=3A022111
- Numbers whose least quadratic nonresidue (A020649) is 7.at n=39A025023
- When squared gives number composed of digits {2,4,8} with each of these digits appearing at least once.at n=2A027679
- T(n, 2*n-3), T given by A027960.at n=23A027965
- Squarefree n such that Q(sqrt(n)) has class number 5.at n=19A029705
- Numbers k such that k^2 has only even digits.at n=45A030097
- Positions of record values in A030787.at n=49A030792
- 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 52.at n=12A031550
- Numbers k whose decimal representation, read as a base-18 value and divided by k, yields an integer.at n=21A032567