28868005 has 8 divisors (see below), whose sum is σ = 34875000. Its totient is φ = 22938816.

The previous prime is 28867999. The next prime is 28868027. The reversal of 28868005 is 50086882.

It can be written as a sum of positive squares in 4 ways, for example, as 320356 + 28547649 = 566^2 + 5343^2 .

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 28868005 - 2⁷ = 28867877 is a prime.

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, 18630 + ... + 20119.

It is an arithmetic number, because the mean of its divisors is an integer number (4359375).

Almost surely, 2^28868005 is an apocalyptic number.

It is an amenable number.

28868005 is a deficient number, since it is larger than the sum of its proper divisors (6006995).

28868005 is a wasteful number, since it uses less digits than its factorization.

28868005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38903.

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 28868005 is about 5372.8954019225. The cubic root of 28868005 is about 306.7648466097.

The spelling of 28868005 in words is "twenty-eight million, eight hundred sixty-eight thousand, five".