28508191 has 2 divisors, whose sum is σ = 28508192. Its totient is φ = 28508190.

The previous prime is 28508171. The next prime is 28508197. The reversal of 28508191 is 19180582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28508191 - 2¹⁵ = 28475423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28508197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14254095 + 14254096.

It is an arithmetic number, because the mean of its divisors is an integer number (14254096).

Almost surely, 2^28508191 is an apocalyptic number.

28508191 is a deficient number, since it is larger than the sum of its proper divisors (1).

28508191 is an equidigital number, since it uses as much as digits as its factorization.

28508191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 28508191 is about 5339.3062283409. The cubic root of 28508191 is about 305.4849974284.

The spelling of 28508191 in words is "twenty-eight million, five hundred eight thousand, one hundred ninety-one".