28008879 has 4 divisors (see below), whose sum is σ = 37345176. Its totient is φ = 18672584.

The previous prime is 28008853. The next prime is 28008887. The reversal of 28008879 is 97880082.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28008879 - 2¹⁵ = 27976111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28008879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28008829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4668144 + ... + 4668149.

It is an arithmetic number, because the mean of its divisors is an integer number (9336294).

Almost surely, 2^28008879 is an apocalyptic number.

28008879 is a deficient number, since it is larger than the sum of its proper divisors (9336297).

28008879 is an equidigital number, since it uses as much as digits as its factorization.

28008879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9336296.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 28008879 is about 5292.3415422665. The cubic root of 28008879 is about 303.6909912638.

The spelling of 28008879 in words is "twenty-eight million, eight thousand, eight hundred seventy-nine".