28321381871 has 16 divisors (see below), whose sum is σ = 29133941760. Its totient is φ = 27518005920.

The previous prime is 28321381831. The next prime is 28321381877. The reversal of 28321381871 is 17818312382.

It is a cyclic number.

It is not a de Polignac number, because 28321381871 - 2¹⁴ = 28321365487 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 (28321381877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7996361 + ... + 7999901.

It is an arithmetic number, because the mean of its divisors is an integer number (1820871360).

Almost surely, 2^28321381871 is an apocalyptic number.

28321381871 is a deficient number, since it is larger than the sum of its proper divisors (812559889).

28321381871 is a wasteful number, since it uses less digits than its factorization.

28321381871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4774.

The product of its digits is 129024, while the sum is 44.

The spelling of 28321381871 in words is "twenty-eight billion, three hundred twenty-one million, three hundred eighty-one thousand, eight hundred seventy-one".