28308404 has 24 divisors (see below), whose sum is σ = 53561760. Its totient is φ = 13045536.

The previous prime is 28308403. The next prime is 28308407. The reversal of 28308404 is 40480382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28308403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2222 + ... + 7845.

It is an arithmetic number, because the mean of its divisors is an integer number (2231740).

Almost surely, 2^28308404 is an apocalyptic number.

It is an amenable number.

28308404 is a deficient number, since it is larger than the sum of its proper divisors (25253356).

28308404 is a wasteful number, since it uses less digits than its factorization.

28308404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10127 (or 10125 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 28308404 is about 5320.5642557909. The cubic root of 28308404 is about 304.7697052210.

Adding to 28308404 its reverse (40480382), we get a palindrome (68788786).

The spelling of 28308404 in words is "twenty-eight million, three hundred eight thousand, four hundred four".