28000911 has 4 divisors (see below), whose sum is σ = 37334552. Its totient is φ = 18667272.

The previous prime is 28000879. The next prime is 28000919. The reversal of 28000911 is 11900082.

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

It is not a de Polignac number, because 28000911 - 2⁵ = 28000879 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 (28000919) 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 in 3 ways as a sum of consecutive naturals, for example, 4666816 + ... + 4666821.

It is an arithmetic number, because the mean of its divisors is an integer number (9333638).

Almost surely, 2^28000911 is an apocalyptic number.

28000911 is a deficient number, since it is larger than the sum of its proper divisors (9333641).

28000911 is an equidigital number, since it uses as much as digits as its factorization.

28000911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9333640.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 28000911 is about 5291.5887028377. The cubic root of 28000911 is about 303.6621904049.

Adding to 28000911 its reverse (11900082), we get a palindrome (39900993).

The spelling of 28000911 in words is "twenty-eight million, nine hundred eleven", and thus it is an aban number.