28671866441871 has 12 divisors (see below), whose sum is σ = 39963559277208. Its totient is φ = 18283509034384.

The previous prime is 28671866441831. The next prime is 28671866441923. The reversal of 28671866441871 is 17814466817682.

It is not a de Polignac number, because 28671866441871 - 2¹⁸ = 28671866179727 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a junction number, because it is equal to n+sod(n) for n = 28671866441796 and 28671866441805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28671866441831) 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 11 ways as a sum of consecutive naturals, for example, 9033352680 + ... + 9033355853.

It is an arithmetic number, because the mean of its divisors is an integer number (3330296606434).

Almost surely, 2^{28671866441871} is an apocalyptic number.

28671866441871 is a deficient number, since it is larger than the sum of its proper divisors (11291692835337).

28671866441871 is a wasteful number, since it uses less digits than its factorization.

28671866441871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18066708582 (or 18066708559 counting only the distinct ones).

The product of its digits is 173408256, while the sum is 69.

The spelling of 28671866441871 in words is "twenty-eight trillion, six hundred seventy-one billion, eight hundred sixty-six million, four hundred forty-one thousand, eight hundred seventy-one".