28728728587165 has 8 divisors (see below), whose sum is σ = 34474518836568. Its totient is φ = 22982953181760.

The previous prime is 28728728587159. The next prime is 28728728587177. The reversal of 28728728587165 is 56178582782782.

It can be written as a sum of positive squares in 4 ways, for example, as 386936249764 + 28341792337401 = 622042^2 + 5323701^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28728728587165 - 2⁹ = 28728728586653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28728728587091 and 28728728587100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1118119 + ... + 7662091.

It is an arithmetic number, because the mean of its divisors is an integer number (4309314854571).

Almost surely, 2^{28728728587165} is an apocalyptic number.

It is an amenable number.

28728728587165 is a deficient number, since it is larger than the sum of its proper divisors (5745790249403).

28728728587165 is an equidigital number, since it uses as much as digits as its factorization.

28728728587165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7421999.

The product of its digits is 1685913600, while the sum is 76.

The spelling of 28728728587165 in words is "twenty-eight trillion, seven hundred twenty-eight billion, seven hundred twenty-eight million, five hundred eighty-seven thousand, one hundred sixty-five".