720328 has 32 divisors (see below), whose sum is σ = 1627200. Its totient is φ = 292032.

The previous prime is 720319. The next prime is 720359. The reversal of 720328 is 823027.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 720299 and 720308.

It is a congruent number.

It is an unprimeable number.

720328 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 726 + ... + 1402.

It is an arithmetic number, because the mean of its divisors is an integer number (50850).

2⁷²⁰³²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (813600).

720328 is an abundant number, since it is smaller than the sum of its proper divisors (906872).

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

720328 is a wasteful number, since it uses less digits than its factorization.

720328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709 (or 705 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 720328 is about 848.7213912704. The cubic root of 720328 is about 89.6417030571.

The spelling of 720328 in words is "seven hundred twenty thousand, three hundred twenty-eight".