720723 has 16 divisors (see below), whose sum is σ = 1016576. Its totient is φ = 453600.

The previous prime is 720703. The next prime is 720743. The reversal of 720723 is 327027.

It is an interprime number because it is at equal distance from previous prime (720703) and next prime (720743).

It is not a de Polignac number, because 720723 - 2⁹ = 720211 is a prime.

It is a Duffinian number.

720723 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 720723.

It is not an unprimeable number, because it can be changed into a prime (720703) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4698 + ... + 4848.

It is an arithmetic number, because the mean of its divisors is an integer number (63536).

2⁷²⁰⁷²³ is an apocalyptic number.

720723 is a deficient number, since it is larger than the sum of its proper divisors (295853).

720723 is a wasteful number, since it uses less digits than its factorization.

720723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234.

The product of its (nonzero) digits is 588, while the sum is 21.

The square root of 720723 is about 848.9540623614. The cubic root of 720723 is about 89.6580854100.

The spelling of 720723 in words is "seven hundred twenty thousand, seven hundred twenty-three", and thus it is an iban number.