28663223 has 8 divisors (see below), whose sum is σ = 30376080. Its totient is φ = 26998720.

The previous prime is 28663213. The next prime is 28663237. The reversal of 28663223 is 32236682.

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

It is a cyclic number.

It is not a de Polignac number, because 28663223 - 2¹⁰ = 28662199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28663223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28663213) 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 7 ways as a sum of consecutive naturals, for example, 10865 + ... + 13242.

It is an arithmetic number, because the mean of its divisors is an integer number (3797010).

Almost surely, 2^28663223 is an apocalyptic number.

28663223 is a deficient number, since it is larger than the sum of its proper divisors (1712857).

28663223 is a wasteful number, since it uses less digits than its factorization.

28663223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24177.

The product of its digits is 20736, while the sum is 32.

The square root of 28663223 is about 5353.8045350946. The cubic root of 28663223 is about 306.0377550351.

The spelling of 28663223 in words is "twenty-eight million, six hundred sixty-three thousand, two hundred twenty-three".