728436391 has 2 divisors, whose sum is σ = 728436392. Its totient is φ = 728436390.

The previous prime is 728436367. The next prime is 728436433. The reversal of 728436391 is 193634827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 728436391 - 2⁷ = 728436263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728436301) 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, 364218195 + 364218196.

It is an arithmetic number, because the mean of its divisors is an integer number (364218196).

Almost surely, 2^728436391 is an apocalyptic number.

728436391 is a deficient number, since it is larger than the sum of its proper divisors (1).

728436391 is an equidigital number, since it uses as much as digits as its factorization.

728436391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 43.

The square root of 728436391 is about 26989.5607781972. The cubic root of 728436391 is about 899.7680023418.

It can be divided in two parts, 728436 and 391, that added together give a palindrome (728827).

The spelling of 728436391 in words is "seven hundred twenty-eight million, four hundred thirty-six thousand, three hundred ninety-one".