8080
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 20
- Divisor Sum
- 18972
- Proper Divisor Sum (Aliquot Sum)
- 10892
- 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
- 3200
- Möbius Function
- 0
- Radical
- 1010
- Omega Function (Ω)
- 6
- Little Omega Function (ω)
- 3
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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 65
- 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 points on surface of 4-dimensional cube.at n=10A008511
- Ordered sequence of distinct terms of the form floor(exp(i) * floor(exp(j))), i,j >= 0.at n=40A022765
- Positive numbers having the same set of digits in base 8 and base 9.at n=32A037441
- Numbers whose consecutive digits differ by 8.at n=17A048410
- Sum of antidiagonals of A060736.at n=24A061349
- Smallest member of triple of consecutive numbers each of which is the sum of two different nonzero squares.at n=36A064715
- Smallest member of three consecutive numbers each of which is the sum of two nonzero squares (not necessarily different).at n=42A064716
- 1/n has period 4 in base 10.at n=33A069858
- Lesser of three consecutive nonsquare integers each of which is the sum of two squares.at n=35A073412
- Square root of n has the same nonzero digit in each of the first 4 places to the right of the decimal point.at n=2A073585
- Octanacci numbers: a(0)=a(1)=...=a(6)=0, a(7)=1; for n >= 8, a(n) = Sum_{i=1..8} a(n-i).at n=21A079262
- Numbers k such that k + (largest digit of k)! is a square.at n=43A095927
- Number of partitions of n into 3-smooth parts.at n=42A105420
- First monotonically increasing sequence such that erasing the first and last digit of each term and concatenating what is left results in the concatenation of all terms of the sequence.at n=36A106004
- Undulating Harshad numbers: numbers divisible by the sum of their own digits with decimal expansions in an abab...ab pattern.at n=41A129120
- Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+521)^2 = y^2.at n=5A129725
- a(n) = 11^n - 9^n.at n=4A139747
- Differences of two positive 4th powers.at n=43A147857
- Differences of two coprime 4th powers.at n=33A147858
- a(n) = n*(n^2+4).at n=20A155965