28120068871 has 4 divisors (see below), whose sum is σ = 28368919152. Its totient is φ = 27871218592.

The previous prime is 28120068869. The next prime is 28120068877. The reversal of 28120068871 is 17886002182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28120068871 - 2¹ = 28120068869 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 (28120068877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124424971 + ... + 124425196.

It is an arithmetic number, because the mean of its divisors is an integer number (7092229788).

Almost surely, 2^28120068871 is an apocalyptic number.

28120068871 is a deficient number, since it is larger than the sum of its proper divisors (248850281).

28120068871 is a wasteful number, since it uses less digits than its factorization.

28120068871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248850280.

The product of its (nonzero) digits is 86016, while the sum is 43.

The spelling of 28120068871 in words is "twenty-eight billion, one hundred twenty million, sixty-eight thousand, eight hundred seventy-one".