728116813 has 2 divisors, whose sum is σ = 728116814. Its totient is φ = 728116812.

The previous prime is 728116799. The next prime is 728116843. The reversal of 728116813 is 318611827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 440916004 + 287200809 = 20998^2 + 16947^2 .

It is an emirp because it is prime and its reverse (318611827) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728116813 is a prime.

It is equal to p_37632178 and since 728116813 and 37632178 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728116843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364058406 + 364058407.

It is an arithmetic number, because the mean of its divisors is an integer number (364058407).

Almost surely, 2^728116813 is an apocalyptic number.

It is an amenable number.

728116813 is a deficient number, since it is larger than the sum of its proper divisors (1).

728116813 is an equidigital number, since it uses as much as digits as its factorization.

728116813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 37.

The square root of 728116813 is about 26983.6397285466. The cubic root of 728116813 is about 899.6364016864.

The spelling of 728116813 in words is "seven hundred twenty-eight million, one hundred sixteen thousand, eight hundred thirteen".