28668823 has 2 divisors, whose sum is σ = 28668824. Its totient is φ = 28668822.

The previous prime is 28668811. The next prime is 28668847. The reversal of 28668823 is 32886682.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28668823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28668823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28668803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14334411 + 14334412.

It is an arithmetic number, because the mean of its divisors is an integer number (14334412).

Almost surely, 2^28668823 is an apocalyptic number.

28668823 is a deficient number, since it is larger than the sum of its proper divisors (1).

28668823 is an equidigital number, since it uses as much as digits as its factorization.

28668823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 43.

The square root of 28668823 is about 5354.3275021239. The cubic root of 28668823 is about 306.0576841713.

The spelling of 28668823 in words is "twenty-eight million, six hundred sixty-eight thousand, eight hundred twenty-three".