728338 has 16 divisors (see below), whose sum is σ = 1191960. Its totient is φ = 331776.

The previous prime is 728333. The next prime is 728369. The reversal of 728338 is 833827.

It can be written as a sum of positive squares in 4 ways, for example, as 710649 + 17689 = 843^2 + 133^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (728333) by changing a digit.

728338 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, 2706 + ... + 2962.

2⁷²⁸³³⁸ is an apocalyptic number.

728338 is a deficient number, since it is larger than the sum of its proper divisors (463622).

728338 is a wasteful number, since it uses less digits than its factorization.

728338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381.

The product of its digits is 8064, while the sum is 31.

The square root of 728338 is about 853.4272083781. The cubic root of 728338 is about 89.9727489511.

The spelling of 728338 in words is "seven hundred twenty-eight thousand, three hundred thirty-eight".