728328865 has 16 divisors (see below), whose sum is σ = 963285120. Its totient is φ = 524229120.

The previous prime is 728328827. The next prime is 728328893. The reversal of 728328865 is 568823827.

It is a happy number.

728328865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 728328865 - 2¹¹ = 728326817 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62925 + ... + 73594.

It is an arithmetic number, because the mean of its divisors is an integer number (60205320).

Almost surely, 2^728328865 is an apocalyptic number.

It is an amenable number.

728328865 is a deficient number, since it is larger than the sum of its proper divisors (234956255).

728328865 is a wasteful number, since it uses less digits than its factorization.

728328865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136632.

The product of its digits is 1290240, while the sum is 49.

The square root of 728328865 is about 26987.5687122794. The cubic root of 728328865 is about 899.7237279589.

The spelling of 728328865 in words is "seven hundred twenty-eight million, three hundred twenty-eight thousand, eight hundred sixty-five".