755
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 912
- Proper Divisor Sum (Aliquot Sum)
- 157
- 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
- 600
- Möbius Function
- 1
- Radical
- 755
- 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
- 64
- Smith 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
Names
- German
- siebenhundertfünfundfünfzig· ordinal: siebenhundertfünfundfünfzigste
- English
- seven hundred fifty-five· ordinal: seven hundred fifty-fifth
- Spanish
- setecientos cincuenta y cinco· ordinal: 755º
- French
- sept cent cinquante-cinq· ordinal: sept cent cinquante-cinqième
- Italian
- settecentocinquantacinque· ordinal: 755º
- Latin
- septingenti quinquaginta quinque· ordinal: 755.
- Portuguese
- setecentos e cinquenta e cinco· ordinal: 755º
Appears in sequences
- Number of trees of diameter 6.at n=7A000251
- Expansion of (Product_{j>=1} (1-(-x)^j) - 1)^9 in powers of x.at n=9A001487
- a(n) = a(n-1) + a(n-2) - 1.at n=14A001588
- Primes multiplied by 5.at n=35A001750
- Rotatable partitions.at n=29A002722
- Numbers that are the sum of 5 positive 4th powers.at n=50A003339
- Expansion of 1/((1-x)*(1-x-2*x^3)).at n=12A003479
- Numbers of the form 2^j + 3^k, for j and k >= 0.at n=59A004050
- a(n) = round(n*phi^7), where phi is the golden ratio, A001622.at n=26A004942
- a(n) = ceiling(n*phi^7), where phi is the golden ratio, A001622.at n=26A004962
- Number of fractions in Farey series of order n.at n=49A005728
- Related to representations as sums of Fibonacci numbers.at n=42A006132
- a(n) is the largest odd number k such that 9, 11, ..., k are sums of 3 of first n odd primes.at n=55A007962
- Coordination sequence T3 for Zeolite Code EUO.at n=17A008098
- Coordination sequence T2 for Zeolite Code MAZ.at n=19A008145
- Coordination sequence T1 for Zeolite Code MTT.at n=17A008189
- Expansion of Jacobi theta constant theta_2^5 /32.at n=43A008439
- Expansion of Jacobi theta constant theta_2^5 /32.at n=48A008439
- Coordination sequence T4 for Zeolite Code DFO.at n=21A009878
- Coordination sequence T5 for Zeolite Code DFO.at n=21A009879