28249187 has 2 divisors, whose sum is σ = 28249188. Its totient is φ = 28249186.

The previous prime is 28249163. The next prime is 28249229. The reversal of 28249187 is 78194282.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28249187 is a prime.

It is not a weakly prime, because it can be changed into another prime (28249127) 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 as a sum of consecutive naturals, namely, 14124593 + 14124594.

It is an arithmetic number, because the mean of its divisors is an integer number (14124594).

Almost surely, 2^28249187 is an apocalyptic number.

28249187 is a deficient number, since it is larger than the sum of its proper divisors (1).

28249187 is an equidigital number, since it uses as much as digits as its factorization.

28249187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 41.

The square root of 28249187 is about 5314.9964252105. The cubic root of 28249187 is about 304.5570457985.

The spelling of 28249187 in words is "twenty-eight million, two hundred forty-nine thousand, one hundred eighty-seven".