28684387 has 2 divisors, whose sum is σ = 28684388. Its totient is φ = 28684386.

The previous prime is 28684363. The next prime is 28684417. The reversal of 28684387 is 78348682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28684387 - 2¹⁵ = 28651619 is a prime.

It is not a weakly prime, because it can be changed into another prime (28684307) 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, 14342193 + 14342194.

It is an arithmetic number, because the mean of its divisors is an integer number (14342194).

Almost surely, 2^28684387 is an apocalyptic number.

28684387 is a deficient number, since it is larger than the sum of its proper divisors (1).

28684387 is an equidigital number, since it uses as much as digits as its factorization.

28684387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 46.

The square root of 28684387 is about 5355.7807087296. The cubic root of 28684387 is about 306.1130593088.

The spelling of 28684387 in words is "twenty-eight million, six hundred eighty-four thousand, three hundred eighty-seven".