720866 has 8 divisors (see below), whose sum is σ = 1128384. Its totient is φ = 344740.

The previous prime is 720857. The next prime is 720869. The reversal of 720866 is 668027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (720869) 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, 7790 + ... + 7881.

It is an arithmetic number, because the mean of its divisors is an integer number (141048).

2⁷²⁰⁸⁶⁶ is an apocalyptic number.

720866 is a deficient number, since it is larger than the sum of its proper divisors (407518).

720866 is a wasteful number, since it uses less digits than its factorization.

720866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15696.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 720866 is about 849.0382794668. The cubic root of 720866 is about 89.6640147607.

The spelling of 720866 in words is "seven hundred twenty thousand, eight hundred sixty-six".