28840105 has 16 divisors (see below), whose sum is σ = 39663360. Its totient is φ = 19720512.

The previous prime is 28840099. The next prime is 28840117. The reversal of 28840105 is 50104882.

It is not a de Polignac number, because 28840105 - 2⁵ = 28840073 is a prime.

It is a super-2 number, since 2×28840105² = 1663503312822050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14427 + ... + 16303.

It is an arithmetic number, because the mean of its divisors is an integer number (2478960).

Almost surely, 2^28840105 is an apocalyptic number.

It is an amenable number.

28840105 is a deficient number, since it is larger than the sum of its proper divisors (10823255).

28840105 is a wasteful number, since it uses less digits than its factorization.

28840105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 28840105 is about 5370.2984088410. The cubic root of 28840105 is about 306.6659886301.

Adding to 28840105 its reverse (50104882), we get a palindrome (78944987).

The spelling of 28840105 in words is "twenty-eight million, eight hundred forty thousand, one hundred five".