28309604 has 12 divisors (see below), whose sum is σ = 50596224. Its totient is φ = 13853544.

The previous prime is 28309591. The next prime is 28309613. The reversal of 28309604 is 40690382.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75104 + ... + 75479.

It is an arithmetic number, because the mean of its divisors is an integer number (4216352).

Almost surely, 2^28309604 is an apocalyptic number.

It is an amenable number.

28309604 is a deficient number, since it is larger than the sum of its proper divisors (22286620).

28309604 is a wasteful number, since it uses less digits than its factorization.

28309604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150634 (or 150632 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 28309604 is about 5320.6770245900. The cubic root of 28309604 is about 304.7740115804.

Adding to 28309604 its reverse (40690382), we get a palindrome (68999986).

The spelling of 28309604 in words is "twenty-eight million, three hundred nine thousand, six hundred four".