28103806 has 4 divisors (see below), whose sum is σ = 42155712. Its totient is φ = 14051902.

The previous prime is 28103783. The next prime is 28103809. The reversal of 28103806 is 60830182.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28103809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7025950 + ... + 7025953.

It is an arithmetic number, because the mean of its divisors is an integer number (10538928).

Almost surely, 2^28103806 is an apocalyptic number.

28103806 is a deficient number, since it is larger than the sum of its proper divisors (14051906).

28103806 is a wasteful number, since it uses less digits than its factorization.

28103806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14051905.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 28103806 is about 5301.3022928333. The cubic root of 28103806 is about 304.0336917299.

Adding to 28103806 its reverse (60830182), we get a palindrome (88933988).

The spelling of 28103806 in words is "twenty-eight million, one hundred three thousand, eight hundred six".