28100105 has 16 divisors (see below), whose sum is σ = 37974528. Its totient is φ = 19776000.

The previous prime is 28100041. The next prime is 28100141. The reversal of 28100105 is 50100182.

It is not a de Polignac number, because 28100105 - 2⁶ = 28100041 is a prime.

It is a super-2 number, since 2×28100105² = 1579231802022050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6536 + ... + 9945.

It is an arithmetic number, because the mean of its divisors is an integer number (2373408).

Almost surely, 2^28100105 is an apocalyptic number.

It is an amenable number.

28100105 is a deficient number, since it is larger than the sum of its proper divisors (9874423).

28100105 is a wasteful number, since it uses less digits than its factorization.

28100105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16528.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 28100105 is about 5300.9532161678. The cubic root of 28100105 is about 304.0203450431.

Adding to 28100105 its reverse (50100182), we get a palindrome (78200287).

The spelling of 28100105 in words is "twenty-eight million, one hundred thousand, one hundred five".