28569649 has 2 divisors, whose sum is σ = 28569650. Its totient is φ = 28569648.

The previous prime is 28569647. The next prime is 28569689. The reversal of 28569649 is 94696582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16459249 + 12110400 = 4057^2 + 3480^2 .

It is a cyclic number.

It is not a de Polignac number, because 28569649 - 2¹ = 28569647 is a prime.

Together with 28569647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28569641) 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, 14284824 + 14284825.

It is an arithmetic number, because the mean of its divisors is an integer number (14284825).

Almost surely, 2^28569649 is an apocalyptic number.

It is an amenable number.

28569649 is a deficient number, since it is larger than the sum of its proper divisors (1).

28569649 is an equidigital number, since it uses as much as digits as its factorization.

28569649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 49.

The square root of 28569649 is about 5345.0583719918. The cubic root of 28569649 is about 305.7043615373.

The spelling of 28569649 in words is "twenty-eight million, five hundred sixty-nine thousand, six hundred forty-nine".