28555845438171 has 32 divisors (see below), whose sum is σ = 38519268353280. Its totient is φ = 18816198113664.

The previous prime is 28555845438149. The next prime is 28555845438179. The reversal of 28555845438171 is 17183454855582.

It is not a de Polignac number, because 28555845438171 - 2¹⁴ = 28555845421787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28555845438179) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 225259521 + ... + 225386253.

It is an arithmetic number, because the mean of its divisors is an integer number (1203727136040).

Almost surely, 2^{28555845438171} is an apocalyptic number.

28555845438171 is a deficient number, since it is larger than the sum of its proper divisors (9963422915109).

28555845438171 is a wasteful number, since it uses less digits than its factorization.

28555845438171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129435.

The product of its digits is 215040000, while the sum is 66.

The spelling of 28555845438171 in words is "twenty-eight trillion, five hundred fifty-five billion, eight hundred forty-five million, four hundred thirty-eight thousand, one hundred seventy-one".