28249811 has 4 divisors (see below), whose sum is σ = 28456152. Its totient is φ = 28043472.

The previous prime is 28249807. The next prime is 28249831. The reversal of 28249811 is 11894282.

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 28249811 - 2² = 28249807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28249831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102965 + ... + 103238.

It is an arithmetic number, because the mean of its divisors is an integer number (7114038).

Almost surely, 2^28249811 is an apocalyptic number.

28249811 is a deficient number, since it is larger than the sum of its proper divisors (206341).

28249811 is a wasteful number, since it uses less digits than its factorization.

28249811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206340.

The product of its digits is 9216, while the sum is 35.

The square root of 28249811 is about 5315.0551267132. The cubic root of 28249811 is about 304.5592882488.

The spelling of 28249811 in words is "twenty-eight million, two hundred forty-nine thousand, eight hundred eleven".