28727368889 has 4 divisors (see below), whose sum is σ = 29654058240. Its totient is φ = 27800679540.

The previous prime is 28727368867. The next prime is 28727368909. The reversal of 28727368889 is 98886372782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98886372782 = 2 ⋅49443186391.

It is a cyclic number.

It is not a de Polignac number, because 28727368889 - 2³² = 24432401593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28727368829) 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 3 ways as a sum of consecutive naturals, for example, 463344629 + ... + 463344690.

It is an arithmetic number, because the mean of its divisors is an integer number (7413514560).

Almost surely, 2^28727368889 is an apocalyptic number.

It is an amenable number.

28727368889 is a deficient number, since it is larger than the sum of its proper divisors (926689351).

28727368889 is an equidigital number, since it uses as much as digits as its factorization.

28727368889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926689350.

The product of its digits is 130056192, while the sum is 68.

The spelling of 28727368889 in words is "twenty-eight billion, seven hundred twenty-seven million, three hundred sixty-eight thousand, eight hundred eighty-nine".