728606 has 4 divisors (see below), whose sum is σ = 1092912. Its totient is φ = 364302.

The previous prime is 728579. The next prime is 728627. The reversal of 728606 is 606827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 606827 = 13 ⋅46679.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

728606 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182150 + ... + 182153.

It is an arithmetic number, because the mean of its divisors is an integer number (273228).

2⁷²⁸⁶⁰⁶ is an apocalyptic number.

728606 is a deficient number, since it is larger than the sum of its proper divisors (364306).

728606 is a wasteful number, since it uses less digits than its factorization.

728606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364305.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 728606 is about 853.5842079139. The cubic root of 728606 is about 89.9837830863.

The spelling of 728606 in words is "seven hundred twenty-eight thousand, six hundred six".