Properties of the Number -644020

Six Hundred Forty-Four Thousand Twenty

Basics

Value: -644021 → -644020 → -644019

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 5 × 13 × 2477

Divisors: 1, 2, 4, 5, 10, 13, 20, 26, 52, 65

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10011101001110110100

Octal: -2351664

Duodecimal: -270844

Hexadecimal: -9d3b4

Square: 414761760400

Square Root: 802.5085669324658

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

Second-order Eulerian triangle T(n,k), 1 <= k <= n. A8517

Coefficient triangle for polynomials used for o.g.f.s for unsigned Stirling1 diagonals. A112007

Triangle of second-order Eulerian numbers T(n,k) (n>=0, 0 <= k <= n) read by rows. A201637

E2(n, k), the second-order Eulerian numbers with E2(0, k) = δ_{0, k}. Triangle read by rows, E2(n, k) for 0 <= k <= n. A340556

Triangle related to the o.g.f.s. of the right-hand columns of A130534 (E(x,m=1,n)). A163936

Fourth diagonal of second-order Eulerian triangle A008517. Fourth column (m=3) of triangle A112007. A112008

Row reversed version of triangle A201637 (second-order Eulerian triangle). A288874

Number of permutations of the multiset {1,1,2,2,...,2n,2n} having exactly n ascents and no number smaller than k between the two occurrences of any number k. A290306