728025161 has 2 divisors, whose sum is σ = 728025162. Its totient is φ = 728025160.

The previous prime is 728025157. The next prime is 728025163. The reversal of 728025161 is 161520827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 727111225 + 913936 = 26965^2 + 956^2 .

It is a cyclic number.

It is not a de Polignac number, because 728025161 - 2² = 728025157 is a prime.

Together with 728025163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (728025163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364012580 + 364012581.

It is an arithmetic number, because the mean of its divisors is an integer number (364012581).

Almost surely, 2^728025161 is an apocalyptic number.

It is an amenable number.

728025161 is a deficient number, since it is larger than the sum of its proper divisors (1).

728025161 is an equidigital number, since it uses as much as digits as its factorization.

728025161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 728025161 is about 26981.9413867868. The cubic root of 728025161 is about 899.5986527365.

Adding to 728025161 its reverse (161520827), we get a palindrome (889545988).

The spelling of 728025161 in words is "seven hundred twenty-eight million, twenty-five thousand, one hundred sixty-one".