28664171 has 2 divisors, whose sum is σ = 28664172. Its totient is φ = 28664170.

The previous prime is 28664137. The next prime is 28664177. The reversal of 28664171 is 17146682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28664171 - 2²² = 24469867 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 (28664177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14332085 + 14332086.

It is an arithmetic number, because the mean of its divisors is an integer number (14332086).

Almost surely, 2^28664171 is an apocalyptic number.

28664171 is a deficient number, since it is larger than the sum of its proper divisors (1).

28664171 is an equidigital number, since it uses as much as digits as its factorization.

28664171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 28664171 is about 5353.8930695336. The cubic root of 28664171 is about 306.0411289356.

The spelling of 28664171 in words is "twenty-eight million, six hundred sixty-four thousand, one hundred seventy-one".