28889144289 has 32 divisors (see below), whose sum is σ = 43521667200. Its totient is φ = 18936815040.

The previous prime is 28889144261. The next prime is 28889144299. The reversal of 28889144289 is 98244198882.

28889144289 is a `hidden beast` number, since 28 + 8 + 8 + 91 + 442 + 89 = 666.

It is not a de Polignac number, because 28889144289 - 2¹¹ = 28889142241 is a prime.

It is a super-2 number, since 2×28889144289² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28889144299) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 348067 + ... + 422999.

It is an arithmetic number, because the mean of its divisors is an integer number (1360052100).

Almost surely, 2^28889144289 is an apocalyptic number.

It is an amenable number.

28889144289 is a deficient number, since it is larger than the sum of its proper divisors (14632522911).

28889144289 is a wasteful number, since it uses less digits than its factorization.

28889144289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75182 (or 75176 counting only the distinct ones).

The product of its digits is 21233664, while the sum is 63.

The spelling of 28889144289 in words is "twenty-eight billion, eight hundred eighty-nine million, one hundred forty-four thousand, two hundred eighty-nine".