28290105 has 24 divisors (see below), whose sum is σ = 49420800. Its totient is φ = 14969760.

The previous prime is 28290103. The next prime is 28290127. The reversal of 28290105 is 50109282.

It is not a de Polignac number, because 28290105 - 2¹ = 28290103 is a prime.

It is a super-2 number, since 2×28290105² = 1600660081822050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28290103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3496 + ... + 8294.

It is an arithmetic number, because the mean of its divisors is an integer number (2059200).

Almost surely, 2^28290105 is an apocalyptic number.

It is an amenable number.

28290105 is a deficient number, since it is larger than the sum of its proper divisors (21130695).

28290105 is a wasteful number, since it uses less digits than its factorization.

28290105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4941 (or 4938 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 28290105 is about 5318.8443293633. The cubic root of 28290105 is about 304.7040217471.

Adding to 28290105 its reverse (50109282), we get a palindrome (78399387).

The spelling of 28290105 in words is "twenty-eight million, two hundred ninety thousand, one hundred five".