28342889 has 8 divisors (see below), whose sum is σ = 30864000. Its totient is φ = 25924752.

The previous prime is 28342871. The next prime is 28342901. The reversal of 28342889 is 98824382.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28342889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28342829) 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, 25169 + ... + 26270.

It is an arithmetic number, because the mean of its divisors is an integer number (3858000).

Almost surely, 2^28342889 is an apocalyptic number.

28342889 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28342889 is a deficient number, since it is larger than the sum of its proper divisors (2521111).

28342889 is a wasteful number, since it uses less digits than its factorization.

28342889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51487.

The product of its digits is 221184, while the sum is 44.

The square root of 28342889 is about 5323.8039971434. The cubic root of 28342889 is about 304.8934107521.

The spelling of 28342889 in words is "twenty-eight million, three hundred forty-two thousand, eight hundred eighty-nine".