728528993 has 4 divisors (see below), whose sum is σ = 729002688. Its totient is φ = 728055300.

The previous prime is 728528987. The next prime is 728529019. The reversal of 728528993 is 399825827.

728528993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728528993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728528963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234533 + ... + 237618.

It is an arithmetic number, because the mean of its divisors is an integer number (182250672).

Almost surely, 2^728528993 is an apocalyptic number.

It is an amenable number.

728528993 is a deficient number, since it is larger than the sum of its proper divisors (473695).

728528993 is a wasteful number, since it uses less digits than its factorization.

728528993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473694.

The product of its digits is 2177280, while the sum is 53.

The square root of 728528993 is about 26991.2762388146. The cubic root of 728528993 is about 899.8061281993.

The spelling of 728528993 in words is "seven hundred twenty-eight million, five hundred twenty-eight thousand, nine hundred ninety-three".