28668667 has 2 divisors, whose sum is σ = 28668668. Its totient is φ = 28668666.

The previous prime is 28668589. The next prime is 28668683. The reversal of 28668667 is 76686682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28668667 - 2⁷ = 28668539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28668667.

It is not a weakly prime, because it can be changed into another prime (28678667) 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, 14334333 + 14334334.

It is an arithmetic number, because the mean of its divisors is an integer number (14334334).

Almost surely, 2^28668667 is an apocalyptic number.

28668667 is a deficient number, since it is larger than the sum of its proper divisors (1).

28668667 is an equidigital number, since it uses as much as digits as its factorization.

28668667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 49.

The square root of 28668667 is about 5354.3129344483. The cubic root of 28668667 is about 306.0571290377.

The spelling of 28668667 in words is "twenty-eight million, six hundred sixty-eight thousand, six hundred sixty-seven".