28897191 has 12 divisors (see below), whose sum is σ = 41839200. Its totient is φ = 19219200.

The previous prime is 28897163. The next prime is 28897201. The reversal of 28897191 is 19179882.

It is not a de Polignac number, because 28897191 - 2¹⁰ = 28896167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28897091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 466 + ... + 7616.

It is an arithmetic number, because the mean of its divisors is an integer number (3486600).

Almost surely, 2^28897191 is an apocalyptic number.

28897191 is a deficient number, since it is larger than the sum of its proper divisors (12942009).

28897191 is a wasteful number, since it uses less digits than its factorization.

28897191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7606 (or 7603 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 28897191 is about 5375.6107559979. The cubic root of 28897191 is about 306.8681931257.

It can be divided in two parts, 288 and 97191, that added together give a palindrome (97479).

The spelling of 28897191 in words is "twenty-eight million, eight hundred ninety-seven thousand, one hundred ninety-one".