1568
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
- 2
Divisibility
- Divisor Count
- 18
- Divisor Sum
- 3591
- Proper Divisor Sum (Aliquot Sum)
- 2023
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 672
- Möbius Function
- 0
- Radical
- 14
- Omega Function (Ω)
- 7
- 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
- 29
- 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
- yes
- Achilles Number
- yes
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Appears in sequences
- a(n) = 2*n^2.at n=28A001105
- Hit polynomials; convolution of natural numbers with Fibonacci numbers F(2), F(3), F(4), ....at n=12A001891
- Numbers which are the sum of 3 nonzero 4th powers.at n=41A003337
- Numbers of form 2^i*7^j, with i, j >= 0.at n=27A003591
- Sums of distinct nonzero 4th powers.at n=41A003999
- a(n) = 1000*log_10(n) rounded to the nearest integer.at n=36A004226
- a(n) = n*(n+1)^2*(n+2)^2/12.at n=6A004282
- a(n) = round(n*phi^7), where phi is the golden ratio, A001622.at n=54A004942
- a(n) = ceiling(n*phi^7), where phi is the golden ratio, A001622.at n=54A004962
- Sequence and first differences (A030124) together list all positive numbers exactly once.at n=50A005228
- Numbers n such that n^32 + 1 is prime.at n=28A006315
- Number of nonseparable rooted toroidal maps with n + 4 edges and n + 1 vertices.at n=2A006409
- Number of loopless tree-rooted planar maps with 3 vertices and n faces and no isthmuses.at n=6A006428
- Exponential self-convolution of Pell numbers.at n=6A006646
- Negated coefficients of Chebyshev T polynomials: a(n) = -A053120(n+10, n), n >= 0.at n=4A006975
- Coordination sequence T2 for Zeolite Code EDI.at n=28A008085
- Coordination sequence T2 for Zeolite Code MTW.at n=26A008197
- Coordination sequence T1 for Zeolite Code PAU.at n=29A008219
- Expansion of 1/((1-x)*(1-x^3)*(1-x^5)*(1-x^7)*(1-x^9)).at n=65A008674
- Coordination sequence T1 for Zeolite Code RSN.at n=26A009885