728920 has 16 divisors (see below), whose sum is σ = 1640160. Its totient is φ = 291552.

The previous prime is 728911. The next prime is 728921. The reversal of 728920 is 29827.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9072 + ... + 9151.

It is an arithmetic number, because the mean of its divisors is an integer number (102510).

2⁷²⁸⁹²⁰ is an apocalyptic number.

It is an amenable number.

728920 is an abundant number, since it is smaller than the sum of its proper divisors (911240).

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

728920 is a wasteful number, since it uses less digits than its factorization.

728920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18234 (or 18230 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 728920 is about 853.7681184022. The cubic root of 728920 is about 89.9967076985.

The spelling of 728920 in words is "seven hundred twenty-eight thousand, nine hundred twenty".