720686 has 8 divisors (see below), whose sum is σ = 1110360. Its totient is φ = 350568.

The previous prime is 720683. The next prime is 720697. The reversal of 720686 is 686027.

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

It is a Curzon number.

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 720686.

It is not an unprimeable number, because it can be changed into a prime (720683) 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, 4796 + ... + 4943.

It is an arithmetic number, because the mean of its divisors is an integer number (138795).

2⁷²⁰⁶⁸⁶ is an apocalyptic number.

720686 is a deficient number, since it is larger than the sum of its proper divisors (389674).

720686 is a wasteful number, since it uses less digits than its factorization.

720686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9778.

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

The square root of 720686 is about 848.9322705611. The cubic root of 720686 is about 89.6565511146.

The spelling of 720686 in words is "seven hundred twenty thousand, six hundred eighty-six".