28009006 has 4 divisors (see below), whose sum is σ = 42013512. Its totient is φ = 14004502.

The previous prime is 28009001. The next prime is 28009019. The reversal of 28009006 is 60090082.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28009001) by changing a digit.

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 as a sum of consecutive naturals, namely, 7002250 + ... + 7002253.

It is an arithmetic number, because the mean of its divisors is an integer number (10503378).

Almost surely, 2^28009006 is an apocalyptic number.

28009006 is a deficient number, since it is larger than the sum of its proper divisors (14004506).

28009006 is a wasteful number, since it uses less digits than its factorization.

28009006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14004505.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 28009006 is about 5292.3535407227. The cubic root of 28009006 is about 303.6914502694.

Adding to 28009006 its reverse (60090082), we get a palindrome (88099088).

It can be divided in two parts, 2 and 8009006, that added together give a palindrome (8009008).

The spelling of 28009006 in words is "twenty-eight million, nine thousand, six".