728557079 has 2 divisors, whose sum is σ = 728557080. Its totient is φ = 728557078.

The previous prime is 728557069. The next prime is 728557139. The reversal of 728557079 is 970755827.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728557079 is a prime.

It is a super-2 number, since 2×728557079² = 1061590834722024482, which contains 22 as substring.

It is a Sophie Germain 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 (728557019) 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, 364278539 + 364278540.

It is an arithmetic number, because the mean of its divisors is an integer number (364278540).

Almost surely, 2^728557079 is an apocalyptic number.

728557079 is a deficient number, since it is larger than the sum of its proper divisors (1).

728557079 is an equidigital number, since it uses as much as digits as its factorization.

728557079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1234800, while the sum is 50.

The square root of 728557079 is about 26991.7965130148. The cubic root of 728557079 is about 899.8176910565.

The spelling of 728557079 in words is "seven hundred twenty-eight million, five hundred fifty-seven thousand, seventy-nine".