728240897 has 2 divisors, whose sum is σ = 728240898. Its totient is φ = 728240896.

The previous prime is 728240879. The next prime is 728240941. The reversal of 728240897 is 798042827.

It is a happy number.

Together with previous prime (728240879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 727326961 + 913936 = 26969^2 + 956^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728240897 is a prime.

It is not a weakly prime, because it can be changed into another prime (728240827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364120448 + 364120449.

It is an arithmetic number, because the mean of its divisors is an integer number (364120449).

Almost surely, 2^728240897 is an apocalyptic number.

It is an amenable number.

728240897 is a deficient number, since it is larger than the sum of its proper divisors (1).

728240897 is an equidigital number, since it uses as much as digits as its factorization.

728240897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 728240897 is about 26985.9388756441. The cubic root of 728240897 is about 899.6875034422.

The spelling of 728240897 in words is "seven hundred twenty-eight million, two hundred forty thousand, eight hundred ninety-seven".