728656 has 10 divisors (see below), whose sum is σ = 1411802. Its totient is φ = 364320.

The previous prime is 728647. The next prime is 728659. The reversal of 728656 is 656827.

It can be written as a sum of positive squares in only one way, i.e., 462400 + 266256 = 680^2 + 516^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728659) by changing a digit.

728656 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 as a sum of consecutive naturals, namely, 22755 + ... + 22786.

2⁷²⁸⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

728656 is a deficient number, since it is larger than the sum of its proper divisors (683146).

728656 is a wasteful number, since it uses less digits than its factorization.

728656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45549 (or 45543 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 728656 is about 853.6134956759. The cubic root of 728656 is about 89.9858413941.

The spelling of 728656 in words is "seven hundred twenty-eight thousand, six hundred fifty-six".