28277191 has 2 divisors, whose sum is σ = 28277192. Its totient is φ = 28277190.

The previous prime is 28277173. The next prime is 28277201. The reversal of 28277191 is 19177282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28277191 - 2⁷ = 28277063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28277191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28277141) 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, 14138595 + 14138596.

It is an arithmetic number, because the mean of its divisors is an integer number (14138596).

Almost surely, 2^28277191 is an apocalyptic number.

28277191 is a deficient number, since it is larger than the sum of its proper divisors (1).

28277191 is an equidigital number, since it uses as much as digits as its factorization.

28277191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 37.

The square root of 28277191 is about 5317.6302052700. The cubic root of 28277191 is about 304.6576504495.

Subtracting from 28277191 its reverse (19177282), we obtain a palindrome (9099909).

The spelling of 28277191 in words is "twenty-eight million, two hundred seventy-seven thousand, one hundred ninety-one".