28005004 has 12 divisors (see below), whose sum is σ = 50333584. Its totient is φ = 13623984.

The previous prime is 28004987. The next prime is 28005011. The reversal of 28005004 is 40050082.

It is a happy number.

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, 94464 + ... + 94759.

Almost surely, 2^28005004 is an apocalyptic number.

It is an amenable number.

28005004 is a deficient number, since it is larger than the sum of its proper divisors (22328580).

28005004 is a wasteful number, since it uses less digits than its factorization.

28005004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189264 (or 189262 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 28005004 is about 5291.9754345613. The cubic root of 28005004 is about 303.6769855044.

Adding to 28005004 its reverse (40050082), we get a palindrome (68055086).

The spelling of 28005004 in words is "twenty-eight million, five thousand, four".