28681103 has 4 divisors (see below), whose sum is σ = 31288488. Its totient is φ = 26073720.

The previous prime is 28681097. The next prime is 28681117. The reversal of 28681103 is 30118682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28681103 - 2¹⁸ = 28418959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28681123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1303676 + ... + 1303697.

It is an arithmetic number, because the mean of its divisors is an integer number (7822122).

Almost surely, 2^28681103 is an apocalyptic number.

28681103 is a deficient number, since it is larger than the sum of its proper divisors (2607385).

28681103 is a wasteful number, since it uses less digits than its factorization.

28681103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2607384.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 28681103 is about 5355.4741153328. The cubic root of 28681103 is about 306.1013768367.

Adding to 28681103 its reverse (30118682), we get a palindrome (58799785).

The spelling of 28681103 in words is "twenty-eight million, six hundred eighty-one thousand, one hundred three".