728805019 has 2 divisors, whose sum is σ = 728805020. Its totient is φ = 728805018.

The previous prime is 728805013. The next prime is 728805043. The reversal of 728805019 is 910508827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 728805019 - 2⁵ = 728804987 is a prime.

It is a super-2 number, since 2×728805019² = 1062313511439180722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (728805013) 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, 364402509 + 364402510.

It is an arithmetic number, because the mean of its divisors is an integer number (364402510).

Almost surely, 2^728805019 is an apocalyptic number.

728805019 is a deficient number, since it is larger than the sum of its proper divisors (1).

728805019 is an equidigital number, since it uses as much as digits as its factorization.

728805019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 728805019 is about 26996.3889992717. The cubic root of 728805019 is about 899.9197537506.

The spelling of 728805019 in words is "seven hundred twenty-eight million, eight hundred five thousand, nineteen".