28280004 has 24 divisors (see below), whose sum is σ = 66120768. Its totient is φ = 9407520.

The previous prime is 28279997. The next prime is 28280047. The reversal of 28280004 is 40008282.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4569 + ... + 8799.

It is an arithmetic number, because the mean of its divisors is an integer number (2755032).

Almost surely, 2^28280004 is an apocalyptic number.

It is an amenable number.

28280004 is an abundant number, since it is smaller than the sum of its proper divisors (37840764).

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

28280004 is a wasteful number, since it uses less digits than its factorization.

28280004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4795 (or 4793 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 28280004 is about 5317.8946962120. The cubic root of 28280004 is about 304.6677525084.

Adding to 28280004 its reverse (40008282), we get a palindrome (68288286).

The spelling of 28280004 in words is "twenty-eight million, two hundred eighty thousand, four".