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Properties of the Number 30780

Thirty Thousand Seven Hundred Eighty

Basics

Value: 30779 → 30780 → 30781

Parity: even

Prime: No

Previous Prime: 30773

Next Prime: 30781

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 2 × 3 4 × 5 × 19

Divisors: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111100000111100

Octal: 74074

Duodecimal: 15990

Hexadecimal: 783c

Square: 947408400

Square Root: 175.44229820656136

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

Longest edge a of smallest (measured by the longest edge) primitive Euler bricks (a, b, c, sqrt(a2 + b2), sqrt(b2 + c2), sqrt(a2 + c2) are integers). A31173
T(n,k)=Number of length n+2 0..k arrays with the sum of second differences multiplied by some arrangement of +-1 equal to zero. A250561
Number of n-step excursions on the 6-dimensional f.c.c. lattice. A271651
Numbers i such that Fibonacci(i) is divisible by i, i+1, and i+2. A298684
a(n) = binomial(2·n, n) mod ((n+1)*(n+2)*(n+3)*(n+4)). A65346
a(n) = (9/2)*(n-1)*(n-2)*(n-3). A134171
Triangle of coefficients of a sequence of binomial type polynomials. A195205
Number of primes <= A214756(n). A214924
Integers i such that 9·i = 25 X i, but 17·i is not 49 X i. A115811
The Wiener index of the Dutch windmill graph D(5,n) (n>=1). A180579