28449791 has 2 divisors, whose sum is σ = 28449792. Its totient is φ = 28449790.

The previous prime is 28449787. The next prime is 28449793. The reversal of 28449791 is 19794482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28449791 - 2² = 28449787 is a prime.

Together with 28449793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28449793) 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, 14224895 + 14224896.

It is an arithmetic number, because the mean of its divisors is an integer number (14224896).

Almost surely, 2^28449791 is an apocalyptic number.

28449791 is a deficient number, since it is larger than the sum of its proper divisors (1).

28449791 is an equidigital number, since it uses as much as digits as its factorization.

28449791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 28449791 is about 5333.8345493650. The cubic root of 28449791 is about 305.2762560190.

The spelling of 28449791 in words is "twenty-eight million, four hundred forty-nine thousand, seven hundred ninety-one".