728006689 has 2 divisors, whose sum is σ = 728006690. Its totient is φ = 728006688.

The previous prime is 728006659. The next prime is 728006729. The reversal of 728006689 is 986600827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518336289 + 209670400 = 22767^2 + 14480^2 .

It is a cyclic number.

It is not a de Polignac number, because 728006689 - 2⁹ = 728006177 is a prime.

It is not a weakly prime, because it can be changed into another prime (728006659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364003344 + 364003345.

It is an arithmetic number, because the mean of its divisors is an integer number (364003345).

Almost surely, 2^728006689 is an apocalyptic number.

It is an amenable number.

728006689 is a deficient number, since it is larger than the sum of its proper divisors (1).

728006689 is an equidigital number, since it uses as much as digits as its factorization.

728006689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 728006689 is about 26981.5990815963. The cubic root of 728006689 is about 899.5910442417.

The spelling of 728006689 in words is "seven hundred twenty-eight million, six thousand, six hundred eighty-nine".