28242011 has 4 divisors (see below), whose sum is σ = 32276592. Its totient is φ = 24207432.

The previous prime is 28242007. The next prime is 28242047. The reversal of 28242011 is 11024282.

It is a happy number.

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 28242011 - 2² = 28242007 is a prime.

It is a super-2 number, since 2×28242011² = 1595222370648242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28242001) 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, 2017280 + ... + 2017293.

It is an arithmetic number, because the mean of its divisors is an integer number (8069148).

Almost surely, 2^28242011 is an apocalyptic number.

28242011 is a deficient number, since it is larger than the sum of its proper divisors (4034581).

28242011 is an equidigital number, since it uses as much as digits as its factorization.

28242011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4034580.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 28242011 is about 5314.3213113247. The cubic root of 28242011 is about 304.5312552457.

Adding to 28242011 its reverse (11024282), we get a palindrome (39266293).

The spelling of 28242011 in words is "twenty-eight million, two hundred forty-two thousand, eleven".