28871109489 has 4 divisors (see below), whose sum is σ = 38494812656. Its totient is φ = 19247406324.

The previous prime is 28871109481. The next prime is 28871109499. The reversal of 28871109489 is 98490117882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28871109489 - 2³ = 28871109481 is a prime.

It is a super-2 number, since 2×28871109489² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28871109481) 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 3 ways as a sum of consecutive naturals, for example, 4811851579 + ... + 4811851584.

It is an arithmetic number, because the mean of its divisors is an integer number (9623703164).

Almost surely, 2^28871109489 is an apocalyptic number.

It is an amenable number.

28871109489 is a deficient number, since it is larger than the sum of its proper divisors (9623703167).

28871109489 is an equidigital number, since it uses as much as digits as its factorization.

28871109489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9623703166.

The product of its (nonzero) digits is 2322432, while the sum is 57.

The spelling of 28871109489 in words is "twenty-eight billion, eight hundred seventy-one million, one hundred nine thousand, four hundred eighty-nine".