28103811 has 8 divisors (see below), whose sum is σ = 38343360. Its totient is φ = 18300072.

The previous prime is 28103809. The next prime is 28103827. The reversal of 28103811 is 11830182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28103811 - 2¹ = 28103809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28103111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108801 + ... + 109058.

It is an arithmetic number, because the mean of its divisors is an integer number (4792920).

Almost surely, 2^28103811 is an apocalyptic number.

28103811 is a deficient number, since it is larger than the sum of its proper divisors (10239549).

28103811 is a wasteful number, since it uses less digits than its factorization.

28103811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217905.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 28103811 is about 5301.3027644156. The cubic root of 28103811 is about 304.0337097603.

Adding to 28103811 its reverse (11830182), we get a palindrome (39933993).

The spelling of 28103811 in words is "twenty-eight million, one hundred three thousand, eight hundred eleven".