28500091 has 2 divisors, whose sum is σ = 28500092. Its totient is φ = 28500090.

The previous prime is 28500089. The next prime is 28500103. The reversal of 28500091 is 19000582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28500091 - 2¹ = 28500089 is a prime.

Together with 28500089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28500071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14250045 + 14250046.

It is an arithmetic number, because the mean of its divisors is an integer number (14250046).

Almost surely, 2^28500091 is an apocalyptic number.

28500091 is a deficient number, since it is larger than the sum of its proper divisors (1).

28500091 is an equidigital number, since it uses as much as digits as its factorization.

28500091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 28500091 is about 5338.5476489397. The cubic root of 28500091 is about 305.4560623191.

The spelling of 28500091 in words is "twenty-eight million, five hundred thousand, ninety-one".