28169147 has 2 divisors, whose sum is σ = 28169148. Its totient is φ = 28169146.

The previous prime is 28169131. The next prime is 28169149. The reversal of 28169147 is 74196182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28169147 - 2⁴ = 28169131 is a prime.

Together with 28169149, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28169147.

It is not a weakly prime, because it can be changed into another prime (28169149) 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, 14084573 + 14084574.

It is an arithmetic number, because the mean of its divisors is an integer number (14084574).

Almost surely, 2^28169147 is an apocalyptic number.

28169147 is a deficient number, since it is larger than the sum of its proper divisors (1).

28169147 is an equidigital number, since it uses as much as digits as its factorization.

28169147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 28169147 is about 5307.4614459269. The cubic root of 28169147 is about 304.2691342098.

The spelling of 28169147 in words is "twenty-eight million, one hundred sixty-nine thousand, one hundred forty-seven".