28668684427 has 2 divisors, whose sum is σ = 28668684428. Its totient is φ = 28668684426.

The previous prime is 28668684419. The next prime is 28668684469. The reversal of 28668684427 is 72448686682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28668684427 - 2³ = 28668684419 is a prime.

It is not a weakly prime, because it can be changed into another prime (28668684827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14334342213 + 14334342214.

It is an arithmetic number, because the mean of its divisors is an integer number (14334342214).

Almost surely, 2^28668684427 is an apocalyptic number.

28668684427 is a deficient number, since it is larger than the sum of its proper divisors (1).

28668684427 is an equidigital number, since it uses as much as digits as its factorization.

28668684427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49545216, while the sum is 61.

The spelling of 28668684427 in words is "twenty-eight billion, six hundred sixty-eight million, six hundred eighty-four thousand, four hundred twenty-seven".