28424191 has 2 divisors, whose sum is σ = 28424192. Its totient is φ = 28424190.

The previous prime is 28424183. The next prime is 28424203. The reversal of 28424191 is 19142482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28424191 - 2³ = 28424183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28424131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14212095 + 14212096.

It is an arithmetic number, because the mean of its divisors is an integer number (14212096).

Almost surely, 2^28424191 is an apocalyptic number.

28424191 is a deficient number, since it is larger than the sum of its proper divisors (1).

28424191 is an equidigital number, since it uses as much as digits as its factorization.

28424191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 31.

The square root of 28424191 is about 5331.4342348002. The cubic root of 28424191 is about 305.1846628751.

The spelling of 28424191 in words is "twenty-eight million, four hundred twenty-four thousand, one hundred ninety-one".