28108663 has 6 divisors (see below), whose sum is σ = 30896432. Its totient is φ = 25553220.

The previous prime is 28108649. The next prime is 28108673. The reversal of 28108663 is 36680182.

It is a de Polignac number, because none of the positive numbers 2^k-28108663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28108643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116031 + ... + 116272.

Almost surely, 2^28108663 is an apocalyptic number.

28108663 is a deficient number, since it is larger than the sum of its proper divisors (2787769).

28108663 is a wasteful number, since it uses less digits than its factorization.

28108663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232325 (or 232314 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 28108663 is about 5301.7603680287. The cubic root of 28108663 is about 304.0512054500.

The spelling of 28108663 in words is "twenty-eight million, one hundred eight thousand, six hundred sixty-three".