720566 has 16 divisors (see below), whose sum is σ = 1347840. Its totient is φ = 280680.

The previous prime is 720547. The next prime is 720569. The reversal of 720566 is 665027.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720569) by changing a digit.

720566 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2186 + ... + 2493.

It is an arithmetic number, because the mean of its divisors is an integer number (84240).

2⁷²⁰⁵⁶⁶ is an apocalyptic number.

720566 is a deficient number, since it is larger than the sum of its proper divisors (627274).

720566 is a wasteful number, since it uses less digits than its factorization.

720566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4699.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 720566 is about 848.8615906024. The cubic root of 720566 is about 89.6515746601.

The spelling of 720566 in words is "seven hundred twenty thousand, five hundred sixty-six".