728308 has 36 divisors (see below), whose sum is σ = 1575840. Its totient is φ = 287712.

The previous prime is 728303. The next prime is 728317. The reversal of 728308 is 803827.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728303) 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 11 ways as a sum of consecutive naturals, for example, 19666 + ... + 19702.

2⁷²⁸³⁰⁸ 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 728308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (787920).

728308 is an abundant number, since it is smaller than the sum of its proper divisors (847532).

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

728308 is a wasteful number, since it uses less digits than its factorization.

728308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 728308 is about 853.4096320056. The cubic root of 728308 is about 89.9715136183.

The spelling of 728308 in words is "seven hundred twenty-eight thousand, three hundred eight".