28717849 has 2 divisors, whose sum is σ = 28717850. Its totient is φ = 28717848.

The previous prime is 28717847. The next prime is 28717853. The reversal of 28717849 is 94871782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18983449 + 9734400 = 4357^2 + 3120^2 .

It is a cyclic number.

It is not a de Polignac number, because 28717849 - 2¹ = 28717847 is a prime.

Together with 28717847, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 28717799 and 28717808.

It is not a weakly prime, because it can be changed into another prime (28717847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14358924 + 14358925.

It is an arithmetic number, because the mean of its divisors is an integer number (14358925).

Almost surely, 2^28717849 is an apocalyptic number.

It is an amenable number.

28717849 is a deficient number, since it is larger than the sum of its proper divisors (1).

28717849 is an equidigital number, since it uses as much as digits as its factorization.

28717849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 46.

The square root of 28717849 is about 5358.9037125143. The cubic root of 28717849 is about 306.2320459279.

The spelling of 28717849 in words is "twenty-eight million, seven hundred seventeen thousand, eight hundred forty-nine".