28008551 has 2 divisors, whose sum is σ = 28008552. Its totient is φ = 28008550.

The previous prime is 28008517. The next prime is 28008559. The reversal of 28008551 is 15580082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28008551 - 2²² = 23814247 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28008559) 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, 14004275 + 14004276.

It is an arithmetic number, because the mean of its divisors is an integer number (14004276).

Almost surely, 2^28008551 is an apocalyptic number.

28008551 is a deficient number, since it is larger than the sum of its proper divisors (1).

28008551 is an equidigital number, since it uses as much as digits as its factorization.

28008551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 28008551 is about 5292.3105540019. The cubic root of 28008551 is about 303.6898057941.

The spelling of 28008551 in words is "twenty-eight million, eight thousand, five hundred fifty-one".