Properties of the Number 30644

Thirty Thousand Six Hundred Forty-Four

Basics

Value: 30643 → 30644 → 30645

Parity: even

Prime: No

Previous Prime: 30643

Next Prime: 30649

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 47 × 163

Divisors: 1, 2, 4, 47, 94, 163, 188, 326, 652, 7661

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111011110110100

Octal: 73664

Duodecimal: 15898

Hexadecimal: 77b4

Square: 939054736

Square Root: 175.05427729707148

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

Smallest k > 0 with gcd(k, rev(k)) = n, where rev(k) is digit reversal of k, or 0 if no such k exists. A69554

G.f.: ∏_n>0 ( (1+xⁿ)/(1-xⁿ) )^n³. A206623

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the upper median of every 2X2 subblock equal. A236902

a(n) = floor(binomial(n,7)/8). A11844

Number of (n+1)X(2+1) 0..2 arrays with the maximum plus the upper median of every 2X2 subblock equal. A236896

Number of (n+1)X(3+1) 0..2 arrays with the maximum plus the upper median of every 2X2 subblock equal. A236897

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11011-01110-00100 pattern in any orientation. A147487

Decimal expansion of 10 - π. A30644