720864 has 36 divisors (see below), whose sum is σ = 2050776. Its totient is φ = 240192.

The previous prime is 720857. The next prime is 720869. The reversal of 720864 is 468027.

It is a tau number, because it is divible by the number of its divisors (36).

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 720864.

It is not an unprimeable number, because it can be changed into a prime (720869) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 964 + ... + 1539.

It is an arithmetic number, because the mean of its divisors is an integer number (56966).

2⁷²⁰⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

720864 is an abundant number, since it is smaller than the sum of its proper divisors (1329912).

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

720864 is a wasteful number, since it uses less digits than its factorization.

720864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2519 (or 2508 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 720864 is about 849.0371016628. The cubic root of 720864 is about 89.6639318382.

The spelling of 720864 in words is "seven hundred twenty thousand, eight hundred sixty-four".