28008668 has 6 divisors (see below), whose sum is σ = 49015176. Its totient is φ = 14004332.

The previous prime is 28008661. The next prime is 28008677. The reversal of 28008668 is 86680082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28008661) 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, 3501080 + ... + 3501087.

It is an arithmetic number, because the mean of its divisors is an integer number (8169196).

Almost surely, 2^28008668 is an apocalyptic number.

It is an amenable number.

28008668 is a deficient number, since it is larger than the sum of its proper divisors (21006508).

28008668 is a wasteful number, since it uses less digits than its factorization.

28008668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7002171 (or 7002169 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 28008668 is about 5292.3216077635. The cubic root of 28008668 is about 303.6902286609.

The spelling of 28008668 in words is "twenty-eight million, eight thousand, six hundred sixty-eight".