28117871 has 2 divisors, whose sum is σ = 28117872. Its totient is φ = 28117870.

The previous prime is 28117819. The next prime is 28117877. The reversal of 28117871 is 17871182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28117871 - 2¹⁴ = 28101487 is a prime.

It is a super-2 number, since 2×28117871² = 1581229339145282, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28117877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14058935 + 14058936.

It is an arithmetic number, because the mean of its divisors is an integer number (14058936).

Almost surely, 2^28117871 is an apocalyptic number.

28117871 is a deficient number, since it is larger than the sum of its proper divisors (1).

28117871 is an equidigital number, since it uses as much as digits as its factorization.

28117871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6272, while the sum is 35.

The square root of 28117871 is about 5302.6286877359. The cubic root of 28117871 is about 304.0844027819.

The spelling of 28117871 in words is "twenty-eight million, one hundred seventeen thousand, eight hundred seventy-one".