728667197 has 2 divisors, whose sum is σ = 728667198. Its totient is φ = 728667196.

The previous prime is 728667193. The next prime is 728667223. The reversal of 728667197 is 791766827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 723125881 + 5541316 = 26891^2 + 2354^2 .

It is an emirp because it is prime and its reverse (791766827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 728667197 - 2² = 728667193 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (728667193) 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, 364333598 + 364333599.

It is an arithmetic number, because the mean of its divisors is an integer number (364333599).

Almost surely, 2^728667197 is an apocalyptic number.

It is an amenable number.

728667197 is a deficient number, since it is larger than the sum of its proper divisors (1).

728667197 is an equidigital number, since it uses as much as digits as its factorization.

728667197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1778112, while the sum is 53.

The square root of 728667197 is about 26993.8362779357. The cubic root of 728667197 is about 899.8630231866.

The spelling of 728667197 in words is "seven hundred twenty-eight million, six hundred sixty-seven thousand, one hundred ninety-seven".