28171285813 has 16 divisors (see below), whose sum is σ = 30919864320. Its totient is φ = 25454201200.

The previous prime is 28171285781. The next prime is 28171285817. The reversal of 28171285813 is 31858217182.

It is a cyclic number.

It is not a de Polignac number, because 28171285813 - 2⁵ = 28171285781 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 (28171285817) 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 15 ways as a sum of consecutive naturals, for example, 2740878 + ... + 2751136.

It is an arithmetic number, because the mean of its divisors is an integer number (1932491520).

Almost surely, 2^28171285813 is an apocalyptic number.

It is an amenable number.

28171285813 is a deficient number, since it is larger than the sum of its proper divisors (2748578507).

28171285813 is a wasteful number, since it uses less digits than its factorization.

28171285813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11768.

The product of its digits is 215040, while the sum is 46.

The spelling of 28171285813 in words is "twenty-eight billion, one hundred seventy-one million, two hundred eighty-five thousand, eight hundred thirteen".