Properties of the Number 64220

Sixty-Four Thousand Two Hundred Twenty

Basics

Value: 64219 → 64220 → 64221

Parity: even

Prime: No

Previous Prime: 64217

Next Prime: 64223

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 5 × 13 ² × 19

Divisors: 1, 2, 4, 5, 10, 13, 19, 20, 26, 38

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1111101011011100

Octal: 175334

Duodecimal: 311B8

Hexadecimal: fadc

Square: 4124208400

Square Root: 253.41665296503305

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Numbers k such that σ(k) = ψ(k) + φ(k) + ω(k)³. A393230

a(n) = Sum{k=0..n} (-1)^n-k*binomial(n, k)*Stirling2(n, k). A343841

Number of 1X10 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2·n² (number of collections of 1 zero-sum 10-vectors with total modulus squared not more than 2·n², ignoring vector and component permutations). A192697

Number of 6-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2. A209487

A triangle sequence of polynomial coefficients:p(x,n)=Sum[Binomial[n, k]*(-x)^k*Sum[StirlingS2[n, m]*x^m, {m, 0, n - k}], {k, 0, n}]. A174859

Numbers k such that (26·10^k + 61)/3 is prime. A288824

T(n,k) is the number of n-bead necklaces labeled with numbers -k..k allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2. A209485

Least k such that k·11ⁿ +/- 1 are twin primes. A64220