Properties of the Number 25640

Twenty-Five Thousand Six Hundred Forty

Basics

Value: 25639 → 25640 → 25641

Parity: even

Prime: No

Previous Prime: 25639

Next Prime: 25643

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ³ × 5 × 641

Divisors: 1, 2, 4, 5, 8, 10, 20, 40, 641, 1282

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110010000101000

Octal: 62050

Duodecimal: 12A08

Hexadecimal: 6428

Square: 657409600

Square Root: 160.12495120998477

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

a(n) = 16n² + n. A157474

a(n) = 64·n² + 2·n. A158070

a(n) = 1600·n² + 40. A158775

Expansion of e.g.f. -LambertW(-2·x / (1 - x))/2. A376098

Numbers such that the largest prime factor equals the sum of the 4th power of the other prime factors. A244344

Number of partitions of n satisfying cn(2,5) + cn(3,5) <= cn(0,5). A39861

Exponent of 3 (value of i) in n-th number of form 3ⁱ*4^j. A25640

Number of (n+1)X(2+1) 0..2 arrays with no 2X2 subblock having its minimum diagonal element less than its minimum antidiagonal element. A250921