28889756897 has 8 divisors (see below), whose sum is σ = 29887403112. Its totient is φ = 27906064000.

The previous prime is 28889756881. The next prime is 28889756911. The reversal of 28889756897 is 79865798882.

It can be written as a sum of positive squares in 4 ways, for example, as 18309841 + 28871447056 = 4279^2 + 169916^2 .

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 28889756897 - 2⁴ = 28889756881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28889056897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3484118 + ... + 3492399.

It is an arithmetic number, because the mean of its divisors is an integer number (3735925389).

Almost surely, 2^28889756897 is an apocalyptic number.

It is an amenable number.

28889756897 is a deficient number, since it is larger than the sum of its proper divisors (997646215).

28889756897 is a wasteful number, since it uses less digits than its factorization.

28889756897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6976659.

The product of its digits is 975421440, while the sum is 77.

The spelling of 28889756897 in words is "twenty-eight billion, eight hundred eighty-nine million, seven hundred fifty-six thousand, eight hundred ninety-seven".