720788 has 12 divisors (see below), whose sum is σ = 1267392. Its totient is φ = 358680.

The previous prime is 720779. The next prime is 720791. The reversal of 720788 is 887027.

It is a happy number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

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 720788.

It is an unprimeable number.

720788 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1223 + ... + 1713.

It is an arithmetic number, because the mean of its divisors is an integer number (105616).

2⁷²⁰⁷⁸⁸ is an apocalyptic number.

It is an amenable number.

720788 is a deficient number, since it is larger than the sum of its proper divisors (546604).

720788 is a wasteful number, since it uses less digits than its factorization.

720788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 860 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 720788 is about 848.9923438995. The cubic root of 720788 is about 89.6607806667.

The spelling of 720788 in words is "seven hundred twenty thousand, seven hundred eighty-eight".