720365 has 4 divisors (see below), whose sum is σ = 864444. Its totient is φ = 576288.

The previous prime is 720361. The next prime is 720367. The reversal of 720365 is 563027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 563027 = 19 ⋅29633.

It can be written as a sum of positive squares in 2 ways, for example, as 413449 + 306916 = 643^2 + 554^2 .

It is a cyclic number.

It is not a de Polignac number, because 720365 - 2² = 720361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 720365.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 720365.

It is not an unprimeable number, because it can be changed into a prime (720361) 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, 72032 + ... + 72041.

It is an arithmetic number, because the mean of its divisors is an integer number (216111).

2⁷²⁰³⁶⁵ is an apocalyptic number.

It is an amenable number.

720365 is a deficient number, since it is larger than the sum of its proper divisors (144079).

720365 is a wasteful number, since it uses less digits than its factorization.

720365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144078.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 720365 is about 848.7431884852. The cubic root of 720365 is about 89.6432378608.

The spelling of 720365 in words is "seven hundred twenty thousand, three hundred sixty-five".