720806 has 8 divisors (see below), whose sum is σ = 1085184. Its totient is φ = 359080.

The previous prime is 720793. The next prime is 720829. The reversal of 720806 is 608027.

720806 = 423² + 424² + ... + 426².

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

It is a super-2 number, since 2×720806² = 1039122579272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296 + ... + 1236.

It is an arithmetic number, because the mean of its divisors is an integer number (135648).

2⁷²⁰⁸⁰⁶ is an apocalyptic number.

720806 is a deficient number, since it is larger than the sum of its proper divisors (364378).

720806 is a wasteful number, since it uses less digits than its factorization.

720806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 720806 is about 849.0029446356. The cubic root of 720806 is about 89.6615270168.

The spelling of 720806 in words is "seven hundred twenty thousand, eight hundred six".