728316 has 18 divisors (see below), whose sum is σ = 1841112. Its totient is φ = 242760.

The previous prime is 728303. The next prime is 728317. The reversal of 728316 is 613827.

It is a tau number, because it is divible by the number of its divisors (18).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 728316.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728317) by changing a digit.

728316 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 5 ways as a sum of consecutive naturals, for example, 10080 + ... + 10151.

It is an arithmetic number, because the mean of its divisors is an integer number (102284).

2⁷²⁸³¹⁶ is an apocalyptic number.

It is an amenable number.

728316 is an abundant number, since it is smaller than the sum of its proper divisors (1112796).

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

728316 is a wasteful number, since it uses less digits than its factorization.

728316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20241 (or 20236 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 728316 is about 853.4143190737. The cubic root of 728316 is about 89.9718430437.

The spelling of 728316 in words is "seven hundred twenty-eight thousand, three hundred sixteen".