728216389 has 2 divisors, whose sum is σ = 728216390. Its totient is φ = 728216388.

The previous prime is 728216371. The next prime is 728216407. The reversal of 728216389 is 983612827.

It is a balanced prime because it is at equal distance from previous prime (728216371) and next prime (728216407).

It can be written as a sum of positive squares in only one way, i.e., 724148100 + 4068289 = 26910^2 + 2017^2 .

It is a cyclic number.

It is not a de Polignac number, because 728216389 - 2⁹ = 728215877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728216329) 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, 364108194 + 364108195.

It is an arithmetic number, because the mean of its divisors is an integer number (364108195).

Almost surely, 2^728216389 is an apocalyptic number.

It is an amenable number.

728216389 is a deficient number, since it is larger than the sum of its proper divisors (1).

728216389 is an equidigital number, since it uses as much as digits as its factorization.

728216389 is an odious number, because the sum of its binary digits is odd.

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

The square root of 728216389 is about 26985.4847834905. The cubic root of 728216389 is about 899.6774107248.

The spelling of 728216389 in words is "seven hundred twenty-eight million, two hundred sixteen thousand, three hundred eighty-nine".