728356 has 6 divisors (see below), whose sum is σ = 1274630. Its totient is φ = 364176.

The previous prime is 728333. The next prime is 728369. The reversal of 728356 is 653827.

It can be written as a sum of positive squares in only one way, i.e., 665856 + 62500 = 816^2 + 250^2 .

It is an unprimeable number.

728356 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, 91041 + ... + 91048.

2⁷²⁸³⁵⁶ is an apocalyptic number.

It is an amenable number.

728356 is a deficient number, since it is larger than the sum of its proper divisors (546274).

728356 is a wasteful number, since it uses less digits than its factorization.

728356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182093 (or 182091 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The square root of 728356 is about 853.4377540278. The cubic root of 728356 is about 89.9734901346.

Subtracting from 728356 its reverse (653827), we obtain a square (74529 = 273²).

The spelling of 728356 in words is "seven hundred twenty-eight thousand, three hundred fifty-six".