28078812289 has 8 divisors (see below), whose sum is σ = 30633670368. Its totient is φ = 25524327360.

The previous prime is 28078812253. The next prime is 28078812337. The reversal of 28078812289 is 98221887082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28078812289 - 2⁹ = 28078811777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28078812889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77689 + ... + 249385.

It is an arithmetic number, because the mean of its divisors is an integer number (3829208796).

Almost surely, 2^28078812289 is an apocalyptic number.

It is an amenable number.

28078812289 is a deficient number, since it is larger than the sum of its proper divisors (2554858079).

28078812289 is a wasteful number, since it uses less digits than its factorization.

28078812289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186575.

The product of its (nonzero) digits is 2064384, while the sum is 55.

The spelling of 28078812289 in words is "twenty-eight billion, seventy-eight million, eight hundred twelve thousand, two hundred eighty-nine".