28041911 has 4 divisors (see below), whose sum is σ = 28056000. Its totient is φ = 28027824.

The previous prime is 28041907. The next prime is 28041913. The reversal of 28041911 is 11914082.

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 28041911 - 2² = 28041907 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 (28041913) 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, 3446 + ... + 8243.

It is an arithmetic number, because the mean of its divisors is an integer number (7014000).

Almost surely, 2^28041911 is an apocalyptic number.

28041911 is a deficient number, since it is larger than the sum of its proper divisors (14089).

28041911 is a wasteful number, since it uses less digits than its factorization.

28041911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14088.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 28041911 is about 5295.4613585598. The cubic root of 28041911 is about 303.8103293718.

Adding to 28041911 its reverse (11914082), we get a palindrome (39955993).

The spelling of 28041911 in words is "twenty-eight million, forty-one thousand, nine hundred eleven".