28103117 has 12 divisors (see below), whose sum is σ = 33820380. Its totient is φ = 23256576.

The previous prime is 28103111. The next prime is 28103177. The reversal of 28103117 is 71130182.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13920361 + 14182756 = 3731^2 + 3766^2 .

It is not a de Polignac number, because 28103117 - 2¹⁴ = 28086733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28103092 and 28103101.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 8468 + ... + 11309.

It is an arithmetic number, because the mean of its divisors is an integer number (2818365).

Almost surely, 2^28103117 is an apocalyptic number.

It is an amenable number.

28103117 is a deficient number, since it is larger than the sum of its proper divisors (5717263).

28103117 is a wasteful number, since it uses less digits than its factorization.

28103117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19820 (or 19813 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 28103117 is about 5301.2373084026. The cubic root of 28103117 is about 304.0312071207.

Adding to 28103117 its reverse (71130182), we get a palindrome (99233299).

The spelling of 28103117 in words is "twenty-eight million, one hundred three thousand, one hundred seventeen".