720816 has 20 divisors (see below), whose sum is σ = 1862232. Its totient is φ = 240256.

The previous prime is 720793. The next prime is 720829. The reversal of 720816 is 618027.

It is a Harshad number since it is a multiple of its sum of digits (24).

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 3 ways as a sum of consecutive naturals, for example, 7461 + ... + 7556.

2⁷²⁰⁸¹⁶ is an apocalyptic number.

It is an amenable number.

720816 is an abundant number, since it is smaller than the sum of its proper divisors (1141416).

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

720816 is a wasteful number, since it uses less digits than its factorization.

720816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15028 (or 15022 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 720816 is about 849.0088338763. The cubic root of 720816 is about 89.6619416504.

The spelling of 720816 in words is "seven hundred twenty thousand, eight hundred sixteen".