28032187 has 2 divisors, whose sum is σ = 28032188. Its totient is φ = 28032186.

The previous prime is 28032143. The next prime is 28032217. The reversal of 28032187 is 78123082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28032187 - 2²³ = 19643579 is a prime.

It is equal to p_1743349 and since 28032187 and 1743349 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28032107) 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 as a sum of consecutive naturals, namely, 14016093 + 14016094.

It is an arithmetic number, because the mean of its divisors is an integer number (14016094).

Almost surely, 2^28032187 is an apocalyptic number.

28032187 is a deficient number, since it is larger than the sum of its proper divisors (1).

28032187 is an equidigital number, since it uses as much as digits as its factorization.

28032187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 28032187 is about 5294.5431342090. The cubic root of 28032187 is about 303.7752082135.

The spelling of 28032187 in words is "twenty-eight million, thirty-two thousand, one hundred eighty-seven".