728066987989 has 16 divisors (see below), whose sum is σ = 802526155200. Its totient is φ = 654987778560.

The previous prime is 728066987987. The next prime is 728066988023. The reversal of 728066987989 is 989789660827.

It is a cyclic number.

It is not a de Polignac number, because 728066987989 - 2¹ = 728066987987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728066987987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12293242 + ... + 12352324.

It is an arithmetic number, because the mean of its divisors is an integer number (50157884700).

Almost surely, 2^728066987989 is an apocalyptic number.

It is an amenable number.

728066987989 is a deficient number, since it is larger than the sum of its proper divisors (74459167211).

728066987989 is a wasteful number, since it uses less digits than its factorization.

728066987989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70740.

The product of its (nonzero) digits is 1316818944, while the sum is 79.

The spelling of 728066987989 in words is "seven hundred twenty-eight billion, sixty-six million, nine hundred eighty-seven thousand, nine hundred eighty-nine".