28243011 has 16 divisors (see below), whose sum is σ = 40041216. Its totient is φ = 17667936.

The previous prime is 28243009. The next prime is 28243021. The reversal of 28243011 is 11034282.

It is not a de Polignac number, because 28243011 - 2¹ = 28243009 is a prime.

It is a super-2 number, since 2×28243011² = 1595335340692242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28243021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205 + ... + 7518.

It is an arithmetic number, because the mean of its divisors is an integer number (2502576).

Almost surely, 2^28243011 is an apocalyptic number.

28243011 is a deficient number, since it is larger than the sum of its proper divisors (11798205).

28243011 is a wasteful number, since it uses less digits than its factorization.

28243011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7802.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 28243011 is about 5314.4153958832. The cubic root of 28243011 is about 304.5348495089.

Adding to 28243011 its reverse (11034282), we get a palindrome (39277293).

The spelling of 28243011 in words is "twenty-eight million, two hundred forty-three thousand, eleven".