Properties of the Number 720

Seven Hundred Twenty

Basics

Value: 719 → 720 → 721

Parity: even

Prime: No

Previous Prime: 719

Next Prime: 727

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 2 ⁴ × 3 ² × 5

Divisors: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1011010000

Octal: 1320

Duodecimal: 500

Hexadecimal: 2d0

Square: 518400

Square Root: 26.832815729997478

Classification

Fibonacci: No

Bell Number: No

Factorial Number: Yes

Regular Number: Yes

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

Factorial numbers: n! = 1·2*3·4*...*n (order of symmetric group S_n, number of permutations of n letters). A142

Least integer of each prime signature A124832; also products of primorial numbers A002110. A25487

Triangle read by rows: T(n,k) = ∑_j>=0 j!*T(n-j-1, k-1) for n >= 0, k >= 0. A84938

Highly composite numbers: numbers n where d(n), the number of divisors of n (A000005), increases to a record. A2182

Numbers all of whose prime divisors are consecutive primes starting at 2. A55932

Triangle read by rows of Stirling numbers of first kind, s(n,k), n >= 1, 1 <= k <= n. A8275

Smallest number with exactly n divisors. A5179

Triangle of Stirling numbers of first kind, s(n,k), n >= 0, 0 <= k <= n. A48994

Triangle of numbers T(n,k) = k!*Stirling2(n,k) read by rows (n >= 1, 1 <= k <= n). A19538

a(n) = (2n)!. A10050

We use cookies

Some cookies are essential for Natory to function, like keeping you signed in. We also use optional cookies to understand how the app is used and improve it over time. Learn more in our Privacy Policy. You can manage your preferences anytime.