28005606 has 24 divisors (see below), whose sum is σ = 60780720. Its totient is φ = 9319536.

The previous prime is 28005569. The next prime is 28005623. The reversal of 28005606 is 60650082.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28005606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15696 + ... + 17388.

It is an arithmetic number, because the mean of its divisors is an integer number (2532530).

Almost surely, 2^28005606 is an apocalyptic number.

28005606 is an abundant number, since it is smaller than the sum of its proper divisors (32775114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28005606 is a wasteful number, since it uses less digits than its factorization.

28005606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2620 (or 2617 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28005606 is about 5292.0323128265. The cubic root of 28005606 is about 303.6791614516.

Adding to 28005606 its reverse (60650082), we get a palindrome (88655688).

The spelling of 28005606 in words is "twenty-eight million, five thousand, six hundred six".