720687 has 8 divisors (see below), whose sum is σ = 1048320. Its totient is φ = 436760.

The previous prime is 720683. The next prime is 720697. The reversal of 720687 is 786027.

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

It is a cyclic number.

It is not a de Polignac number, because 720687 - 2² = 720683 is a prime.

720687 is a lucky number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 10887 + ... + 10952.

It is an arithmetic number, because the mean of its divisors is an integer number (131040).

2⁷²⁰⁶⁸⁷ is an apocalyptic number.

720687 is a deficient number, since it is larger than the sum of its proper divisors (327633).

720687 is a wasteful number, since it uses less digits than its factorization.

720687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21853.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 720687 is about 848.9328595360. The cubic root of 720687 is about 89.6565925828.

The spelling of 720687 in words is "seven hundred twenty thousand, six hundred eighty-seven".