28321004 has 24 divisors (see below), whose sum is σ = 52926720. Its totient is φ = 13227984.

The previous prime is 28320979. The next prime is 28321061. The reversal of 28321004 is 40012382.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377 + ... + 7535.

It is an arithmetic number, because the mean of its divisors is an integer number (2205280).

Almost surely, 2^28321004 is an apocalyptic number.

It is an amenable number.

28321004 is a deficient number, since it is larger than the sum of its proper divisors (24605716).

28321004 is a wasteful number, since it uses less digits than its factorization.

28321004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7229 (or 7227 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 28321004 is about 5321.7482090005. The cubic root of 28321004 is about 304.8149159258.

Adding to 28321004 its reverse (40012382), we get a palindrome (68333386).

The spelling of 28321004 in words is "twenty-eight million, three hundred twenty-one thousand, four".