28785091 has 2 divisors, whose sum is σ = 28785092. Its totient is φ = 28785090.

The previous prime is 28785083. The next prime is 28785179. The reversal of 28785091 is 19058782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28785091 - 2³ = 28785083 is a prime.

It is not a weakly prime, because it can be changed into another prime (28785191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14392545 + 14392546.

It is an arithmetic number, because the mean of its divisors is an integer number (14392546).

Almost surely, 2^28785091 is an apocalyptic number.

28785091 is a deficient number, since it is larger than the sum of its proper divisors (1).

28785091 is an equidigital number, since it uses as much as digits as its factorization.

28785091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 28785091 is about 5365.1739021210. The cubic root of 28785091 is about 306.4708707382.

The spelling of 28785091 in words is "twenty-eight million, seven hundred eighty-five thousand, ninety-one".