28211384871 has 12 divisors (see below), whose sum is σ = 41307995248. Its totient is φ = 18549951264.

The previous prime is 28211384869. The next prime is 28211384881. The reversal of 28211384871 is 17848311282.

It is not a de Polignac number, because 28211384871 - 2¹ = 28211384869 is a prime.

It is a super-3 number, since 3×28211384871³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28211384881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21469195 + ... + 21470508.

Almost surely, 2^28211384871 is an apocalyptic number.

28211384871 is a deficient number, since it is larger than the sum of its proper divisors (13096610377).

28211384871 is a wasteful number, since it uses less digits than its factorization.

28211384871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42939782 (or 42939779 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The spelling of 28211384871 in words is "twenty-eight billion, two hundred eleven million, three hundred eighty-four thousand, eight hundred seventy-one".