28543091 has 2 divisors, whose sum is σ = 28543092. Its totient is φ = 28543090.

The previous prime is 28543087. The next prime is 28543129. The reversal of 28543091 is 19034582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28543091 - 2² = 28543087 is a prime.

It is not a weakly prime, because it can be changed into another prime (28543001) 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, 14271545 + 14271546.

It is an arithmetic number, because the mean of its divisors is an integer number (14271546).

Almost surely, 2^28543091 is an apocalyptic number.

28543091 is a deficient number, since it is larger than the sum of its proper divisors (1).

28543091 is an equidigital number, since it uses as much as digits as its factorization.

28543091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 28543091 is about 5342.5734435757. The cubic root of 28543091 is about 305.6096058115.

The spelling of 28543091 in words is "twenty-eight million, five hundred forty-three thousand, ninety-one".