728836 has 6 divisors (see below), whose sum is σ = 1275470. Its totient is φ = 364416.

The previous prime is 728831. The next prime is 728837. The reversal of 728836 is 638827.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 498436 + 230400 = 706^2 + 480^2 .

It is not an unprimeable number, because it can be changed into a prime (728831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91101 + ... + 91108.

2⁷²⁸⁸³⁶ is an apocalyptic number.

It is an amenable number.

728836 is a deficient number, since it is larger than the sum of its proper divisors (546634).

728836 is a wasteful number, since it uses less digits than its factorization.

728836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182213 (or 182211 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 728836 is about 853.7189232997. The cubic root of 728836 is about 89.9932505226.

Subtracting from 728836 its reverse (638827), we obtain a palindrome (90009).

The spelling of 728836 in words is "seven hundred twenty-eight thousand, eight hundred thirty-six".