728744290561 has 16 divisors (see below), whose sum is σ = 841223395584. Its totient is φ = 618362518464.

The previous prime is 728744290531. The next prime is 728744290613. The reversal of 728744290561 is 165092447827.

It is a cyclic number.

It is not a de Polignac number, because 728744290561 - 2⁹ = 728744290049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728744290531) 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 in 15 ways as a sum of consecutive naturals, for example, 1961091 + ... + 2302903.

It is an arithmetic number, because the mean of its divisors is an integer number (52576462224).

Almost surely, 2^728744290561 is an apocalyptic number.

It is an amenable number.

728744290561 is a deficient number, since it is larger than the sum of its proper divisors (112479105023).

728744290561 is a wasteful number, since it uses less digits than its factorization.

728744290561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344880.

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 728744290561 in words is "seven hundred twenty-eight billion, seven hundred forty-four million, two hundred ninety thousand, five hundred sixty-one".