720804 has 24 divisors (see below), whose sum is σ = 1922368. Its totient is φ = 205920.

The previous prime is 720793. The next prime is 720829. The reversal of 720804 is 408027.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 720804.

It is an unprimeable 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 7 ways as a sum of consecutive naturals, for example, 4207 + ... + 4374.

2⁷²⁰⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

720804 is an abundant number, since it is smaller than the sum of its proper divisors (1201564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

720804 is a wasteful number, since it uses less digits than its factorization.

720804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8595 (or 8593 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 720804 is about 849.0017667826. The cubic root of 720804 is about 89.6614440896.

The spelling of 720804 in words is "seven hundred twenty thousand, eight hundred four".