28504871 has 2 divisors, whose sum is σ = 28504872. Its totient is φ = 28504870.

The previous prime is 28504793. The next prime is 28504877. The reversal of 28504871 is 17840582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28504871 - 2¹⁰ = 28503847 is a 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 (28504877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14252435 + 14252436.

It is an arithmetic number, because the mean of its divisors is an integer number (14252436).

Almost surely, 2^28504871 is an apocalyptic number.

28504871 is a deficient number, since it is larger than the sum of its proper divisors (1).

28504871 is an equidigital number, since it uses as much as digits as its factorization.

28504871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 28504871 is about 5338.9953174731. The cubic root of 28504871 is about 305.4731382687.

The spelling of 28504871 in words is "twenty-eight million, five hundred four thousand, eight hundred seventy-one".