720165 has 16 divisors (see below), whose sum is σ = 1181376. Its totient is φ = 374400.

The previous prime is 720151. The next prime is 720173. The reversal of 720165 is 561027.

It is not a de Polignac number, because 720165 - 2⁵ = 720133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30 + ... + 1200.

It is an arithmetic number, because the mean of its divisors is an integer number (73836).

2⁷²⁰¹⁶⁵ is an apocalyptic number.

It is an amenable number.

720165 is a deficient number, since it is larger than the sum of its proper divisors (461211).

720165 is a wasteful number, since it uses less digits than its factorization.

720165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 720165 is about 848.6253590366. The cubic root of 720165 is about 89.6349409988.

The spelling of 720165 in words is "seven hundred twenty thousand, one hundred sixty-five".