28445771 has 2 divisors, whose sum is σ = 28445772. Its totient is φ = 28445770.

The previous prime is 28445761. The next prime is 28445773. The reversal of 28445771 is 17754482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28445771 - 2¹⁰ = 28444747 is a prime.

It is a Sophie Germain prime.

Together with 28445773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28445773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14222885 + 14222886.

It is an arithmetic number, because the mean of its divisors is an integer number (14222886).

Almost surely, 2^28445771 is an apocalyptic number.

28445771 is a deficient number, since it is larger than the sum of its proper divisors (1).

28445771 is an equidigital number, since it uses as much as digits as its factorization.

28445771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62720, while the sum is 38.

The square root of 28445771 is about 5333.4576964667. The cubic root of 28445771 is about 305.2618766708.

The spelling of 28445771 in words is "twenty-eight million, four hundred forty-five thousand, seven hundred seventy-one".