28364689 has 2 divisors, whose sum is σ = 28364690. Its totient is φ = 28364688.

The previous prime is 28364671. The next prime is 28364711. The reversal of 28364689 is 98646382.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24830289 + 3534400 = 4983^2 + 1880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28364689 is a prime.

It is not a weakly prime, because it can be changed into another prime (28364629) 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, 14182344 + 14182345.

It is an arithmetic number, because the mean of its divisors is an integer number (14182345).

Almost surely, 2^28364689 is an apocalyptic number.

It is an amenable number.

28364689 is a deficient number, since it is larger than the sum of its proper divisors (1).

28364689 is an equidigital number, since it uses as much as digits as its factorization.

28364689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 46.

The square root of 28364689 is about 5325.8510118102. The cubic root of 28364689 is about 304.9715605481.

The spelling of 28364689 in words is "twenty-eight million, three hundred sixty-four thousand, six hundred eighty-nine".