28260191 has 2 divisors, whose sum is σ = 28260192. Its totient is φ = 28260190.

The previous prime is 28260179. The next prime is 28260247. The reversal of 28260191 is 19106282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28260191 - 2¹⁰ = 28259167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28260161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14130095 + 14130096.

It is an arithmetic number, because the mean of its divisors is an integer number (14130096).

Almost surely, 2^28260191 is an apocalyptic number.

28260191 is a deficient number, since it is larger than the sum of its proper divisors (1).

28260191 is an equidigital number, since it uses as much as digits as its factorization.

28260191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 28260191 is about 5316.0315085597. The cubic root of 28260191 is about 304.5965857054.

The spelling of 28260191 in words is "twenty-eight million, two hundred sixty thousand, one hundred ninety-one".