28189305517 has 32 divisors (see below), whose sum is σ = 30872088576. Its totient is φ = 25665868800.

The previous prime is 28189305511. The next prime is 28189305523. The reversal of 28189305517 is 71550398182.

It is an interprime number because it is at equal distance from previous prime (28189305511) and next prime (28189305523).

It is a de Polignac number, because none of the positive numbers 2^k-28189305517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28189305511) 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 31 ways as a sum of consecutive naturals, for example, 9544513 + ... + 9547465.

It is an arithmetic number, because the mean of its divisors is an integer number (964752768).

Almost surely, 2^28189305517 is an apocalyptic number.

It is an amenable number.

28189305517 is a deficient number, since it is larger than the sum of its proper divisors (2682783059).

28189305517 is a wasteful number, since it uses less digits than its factorization.

28189305517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3261.

The product of its (nonzero) digits is 604800, while the sum is 49.

The spelling of 28189305517 in words is "twenty-eight billion, one hundred eighty-nine million, three hundred five thousand, five hundred seventeen".