28005604 has 24 divisors (see below), whose sum is σ = 53611488. Its totient is φ = 12695040.

The previous prime is 28005569. The next prime is 28005623. The reversal of 28005604 is 40650082.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22404 + ... + 23620.

It is an arithmetic number, because the mean of its divisors is an integer number (2233812).

Almost surely, 2^28005604 is an apocalyptic number.

It is an amenable number.

28005604 is a deficient number, since it is larger than the sum of its proper divisors (25605884).

28005604 is a wasteful number, since it uses less digits than its factorization.

28005604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1755 (or 1753 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 28005604 is about 5292.0321238632. The cubic root of 28005604 is about 303.6791542226.

Adding to 28005604 its reverse (40650082), we get a palindrome (68655686).

The spelling of 28005604 in words is "twenty-eight million, five thousand, six hundred four".