28163287 has 2 divisors, whose sum is σ = 28163288. Its totient is φ = 28163286.

The previous prime is 28163243. The next prime is 28163309. The reversal of 28163287 is 78236182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28163287 - 2¹⁵ = 28130519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28163587) 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, 14081643 + 14081644.

It is an arithmetic number, because the mean of its divisors is an integer number (14081644).

Almost surely, 2^28163287 is an apocalyptic number.

28163287 is a deficient number, since it is larger than the sum of its proper divisors (1).

28163287 is an equidigital number, since it uses as much as digits as its factorization.

28163287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 28163287 is about 5306.9093642157. The cubic root of 28163287 is about 304.2480338102.

The spelling of 28163287 in words is "twenty-eight million, one hundred sixty-three thousand, two hundred eighty-seven".