28103105 has 8 divisors (see below), whose sum is σ = 33772200. Its totient is φ = 22450176.

The previous prime is 28103077. The next prime is 28103111. The reversal of 28103105 is 50130182.

It can be written as a sum of positive squares in 4 ways, for example, as 1560001 + 26543104 = 1249^2 + 5152^2 .

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 28103105 - 2¹² = 28099009 is a prime.

It is a Curzon 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, 191 + ... + 7499.

It is an arithmetic number, because the mean of its divisors is an integer number (4221525).

Almost surely, 2^28103105 is an apocalyptic number.

It is an amenable number.

28103105 is a deficient number, since it is larger than the sum of its proper divisors (5669095).

28103105 is an equidigital number, since it uses as much as digits as its factorization.

28103105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8083.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 28103105 is about 5301.2361765913. The cubic root of 28103105 is about 304.0311638470.

Adding to 28103105 its reverse (50130182), we get a palindrome (78233287).

The spelling of 28103105 in words is "twenty-eight million, one hundred three thousand, one hundred five".