Properties of the Number -64980

Sixty-Four Thousand Nine Hundred Eighty

Basics

Value: -64981 → -64980 → -64979

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 ² × 3 ² × 5 × 19 ²

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

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1111110111010100

Octal: -176724

Duodecimal: -31730

Hexadecimal: -fdd4

Square: 4222400400

Square Root: 254.91174943497603

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) = n² * (n² - 1)/2. A83374

Expansion of ∏_k>=1 1/(1 - k·x^k)^k². A285241

Let T(n) = n(n+1)/2 be the n-th triangular number (A000217); a(n) = T(8T(n)). A185096

Column 3 of triangle A123610. A123613

Number of 2 X 2 matrices with all terms in {0,1,...,n} and odd trace. A210379

Triangular numbers that are the product of a square number and a prime number. A253653

Triangular numbers that are the product of a triangular number and a square number (both greater than 1). A253650

a(n) is the number of numbers of the form k + reverse(k) for at least one n-digit number k. A358985

Triangular numbers that are sandwiched between two semiprimes; or triangular numbers t such that t-1 and t+1 are both semiprime. A121898

a(n) = ((n-th prime)⁴-(n-th prime)²)/2. A138418