28089191 has 16 divisors (see below), whose sum is σ = 31305120. Its totient is φ = 25038720.

The previous prime is 28089181. The next prime is 28089241. The reversal of 28089191 is 19198082.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28089191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28089101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60701 + ... + 61161.

It is an arithmetic number, because the mean of its divisors is an integer number (1956570).

Almost surely, 2^28089191 is an apocalyptic number.

28089191 is a deficient number, since it is larger than the sum of its proper divisors (3215929).

28089191 is a wasteful number, since it uses less digits than its factorization.

28089191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 28089191 is about 5299.9236786958. The cubic root of 28089191 is about 303.9809797368.

The spelling of 28089191 in words is "twenty-eight million, eighty-nine thousand, one hundred ninety-one".