728566161 has 16 divisors (see below), whose sum is σ = 1046001600. Its totient is φ = 449389568.

The previous prime is 728566141. The next prime is 728566171. The reversal of 728566161 is 161665827.

It is a cyclic number.

It is not a de Polignac number, because 728566161 - 2¹³ = 728557969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (728566121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118056 + ... + 124073.

It is an arithmetic number, because the mean of its divisors is an integer number (65375100).

Almost surely, 2^728566161 is an apocalyptic number.

It is an amenable number.

728566161 is a deficient number, since it is larger than the sum of its proper divisors (317435439).

728566161 is a wasteful number, since it uses less digits than its factorization.

728566161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242208.

The product of its digits is 120960, while the sum is 42.

The square root of 728566161 is about 26991.9647487914. The cubic root of 728566161 is about 899.8214300042.

The spelling of 728566161 in words is "seven hundred twenty-eight million, five hundred sixty-six thousand, one hundred sixty-one".