28008005 has 8 divisors (see below), whose sum is σ = 34324992. Its totient is φ = 21929488.

The previous prime is 28007981. The next prime is 28008017. The reversal of 28008005 is 50080082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28008005 - 2¹² = 28003909 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 59357 + ... + 59826.

It is an arithmetic number, because the mean of its divisors is an integer number (4290624).

Almost surely, 2^28008005 is an apocalyptic number.

It is an amenable number.

28008005 is a deficient number, since it is larger than the sum of its proper divisors (6316987).

28008005 is a wasteful number, since it uses less digits than its factorization.

28008005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119235.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 28008005 is about 5292.2589694761. The cubic root of 28008005 is about 303.6878324002.

Adding to 28008005 its reverse (50080082), we get a palindrome (78088087).

The spelling of 28008005 in words is "twenty-eight million, eight thousand, five".