28245911 has 4 divisors (see below), whose sum is σ = 29009352. Its totient is φ = 27482472.

The previous prime is 28245907. The next prime is 28245961. The reversal of 28245911 is 11954282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28245911 - 2² = 28245907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28245901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381665 + ... + 381738.

It is an arithmetic number, because the mean of its divisors is an integer number (7252338).

Almost surely, 2^28245911 is an apocalyptic number.

28245911 is a deficient number, since it is larger than the sum of its proper divisors (763441).

28245911 is an equidigital number, since it uses as much as digits as its factorization.

28245911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763440.

The product of its digits is 5760, while the sum is 32.

The square root of 28245911 is about 5314.6882316840. The cubic root of 28245911 is about 304.5452723923.

The spelling of 28245911 in words is "twenty-eight million, two hundred forty-five thousand, nine hundred eleven".