28304211 has 8 divisors (see below), whose sum is σ = 40642000. Its totient is φ = 17417952.

The previous prime is 28304207. The next prime is 28304219. The reversal of 28304211 is 11240382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28304211 - 2² = 28304207 is a prime.

It is a super-2 number, since 2×28304211² = 1602256720665042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28304219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362836 + ... + 362913.

It is an arithmetic number, because the mean of its divisors is an integer number (5080250).

Almost surely, 2^28304211 is an apocalyptic number.

28304211 is a deficient number, since it is larger than the sum of its proper divisors (12337789).

28304211 is a wasteful number, since it uses less digits than its factorization.

28304211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725765.

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

The square root of 28304211 is about 5320.1702040442. The cubic root of 28304211 is about 304.7546571282.

Adding to 28304211 its reverse (11240382), we get a palindrome (39544593).

The spelling of 28304211 in words is "twenty-eight million, three hundred four thousand, two hundred eleven".