28686473 has 2 divisors, whose sum is σ = 28686474. Its totient is φ = 28686472.

The previous prime is 28686431. The next prime is 28686491. The reversal of 28686473 is 37468682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26759929 + 1926544 = 5173^2 + 1388^2 .

It is a cyclic number.

It is not a de Polignac number, because 28686473 - 2¹⁶ = 28620937 is a prime.

It is not a weakly prime, because it can be changed into another prime (28686173) 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, 14343236 + 14343237.

It is an arithmetic number, because the mean of its divisors is an integer number (14343237).

Almost surely, 2^28686473 is an apocalyptic number.

It is an amenable number.

28686473 is a deficient number, since it is larger than the sum of its proper divisors (1).

28686473 is an equidigital number, since it uses as much as digits as its factorization.

28686473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 44.

The square root of 28686473 is about 5355.9754480393. The cubic root of 28686473 is about 306.1204795634.

The spelling of 28686473 in words is "twenty-eight million, six hundred eighty-six thousand, four hundred seventy-three".