28889305 has 8 divisors (see below), whose sum is σ = 34880832. Its totient is φ = 22969008.

The previous prime is 28889281. The next prime is 28889309. The reversal of 28889305 is 50398882.

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-28889305 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28889309) 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, 16909 + ... + 18538.

It is an arithmetic number, because the mean of its divisors is an integer number (4360104).

Almost surely, 2^28889305 is an apocalyptic number.

It is an amenable number.

28889305 is a deficient number, since it is larger than the sum of its proper divisors (5991527).

28889305 is a wasteful number, since it uses less digits than its factorization.

28889305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35615.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 28889305 is about 5374.8772078997. The cubic root of 28889305 is about 306.8402759631.

The spelling of 28889305 in words is "twenty-eight million, eight hundred eighty-nine thousand, three hundred five".