728543917 has 2 divisors, whose sum is σ = 728543918. Its totient is φ = 728543916.

The previous prime is 728543839. The next prime is 728543941. The reversal of 728543917 is 719345827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 637360516 + 91183401 = 25246^2 + 9549^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728543917 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728543947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364271958 + 364271959.

It is an arithmetic number, because the mean of its divisors is an integer number (364271959).

Almost surely, 2^728543917 is an apocalyptic number.

It is an amenable number.

728543917 is a deficient number, since it is larger than the sum of its proper divisors (1).

728543917 is an equidigital number, since it uses as much as digits as its factorization.

728543917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 46.

The square root of 728543917 is about 26991.5526970940. The cubic root of 728543917 is about 899.8122723680.

The spelling of 728543917 in words is "seven hundred twenty-eight million, five hundred forty-three thousand, nine hundred seventeen".