28191727 has 2 divisors, whose sum is σ = 28191728. Its totient is φ = 28191726.

The previous prime is 28191677. The next prime is 28191739. The reversal of 28191727 is 72719182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28191727 - 2⁷ = 28191599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28191227) 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, 14095863 + 14095864.

It is an arithmetic number, because the mean of its divisors is an integer number (14095864).

Almost surely, 2^28191727 is an apocalyptic number.

28191727 is a deficient number, since it is larger than the sum of its proper divisors (1).

28191727 is an equidigital number, since it uses as much as digits as its factorization.

28191727 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 28191727 is about 5309.5882137883. The cubic root of 28191727 is about 304.3504118115.

The spelling of 28191727 in words is "twenty-eight million, one hundred ninety-one thousand, seven hundred twenty-seven".