28304011 has 12 divisors (see below), whose sum is σ = 29574432. Its totient is φ = 27074864.

The previous prime is 28303999. The next prime is 28304021. The reversal of 28304011 is 11040382.

It is not a de Polignac number, because 28304011 - 2¹⁹ = 27779723 is a prime.

It is a super-2 number, since 2×28304011² = 1602234077376242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28304011.

It is not an unprimeable number, because it can be changed into a prime (28304021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 163521 + ... + 163693.

It is an arithmetic number, because the mean of its divisors is an integer number (2464536).

Almost surely, 2^28304011 is an apocalyptic number.

28304011 is a deficient number, since it is larger than the sum of its proper divisors (1270421).

28304011 is an equidigital number, since it uses as much as digits as its factorization.

28304011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 28304011 is about 5320.1514076199. The cubic root of 28304011 is about 304.7539393190.

Adding to 28304011 its reverse (11040382), we get a palindrome (39344393).

The spelling of 28304011 in words is "twenty-eight million, three hundred four thousand, eleven".