720287 has 4 divisors (see below), whose sum is σ = 722040. Its totient is φ = 718536.

The previous prime is 720283. The next prime is 720289. The reversal of 720287 is 782027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782027 = 709 ⋅1103.

It is a cyclic number.

It is not a de Polignac number, because 720287 - 2² = 720283 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113 + ... + 1205.

It is an arithmetic number, because the mean of its divisors is an integer number (180510).

2⁷²⁰²⁸⁷ is an apocalyptic number.

720287 is a deficient number, since it is larger than the sum of its proper divisors (1753).

720287 is a wasteful number, since it uses less digits than its factorization.

720287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 720287 is about 848.6972369461. The cubic root of 720287 is about 89.6400022673.

The spelling of 720287 in words is "seven hundred twenty thousand, two hundred eighty-seven".