28445171 has 2 divisors, whose sum is σ = 28445172. Its totient is φ = 28445170.

The previous prime is 28445167. The next prime is 28445177. The reversal of 28445171 is 17154482.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28445171 - 2² = 28445167 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28445177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14222585 + 14222586.

It is an arithmetic number, because the mean of its divisors is an integer number (14222586).

Almost surely, 2^28445171 is an apocalyptic number.

28445171 is a deficient number, since it is larger than the sum of its proper divisors (1).

28445171 is an equidigital number, since it uses as much as digits as its factorization.

28445171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 32.

The square root of 28445171 is about 5333.4014474817. The cubic root of 28445171 is about 305.2597303832.

The spelling of 28445171 in words is "twenty-eight million, four hundred forty-five thousand, one hundred seventy-one".