28660823 has 4 divisors (see below), whose sum is σ = 28705368. Its totient is φ = 28616280.

The previous prime is 28660817. The next prime is 28660837. The reversal of 28660823 is 32806682.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28660823 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 (28660223) 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, 21293 + ... + 22598.

It is an arithmetic number, because the mean of its divisors is an integer number (7176342).

Almost surely, 2^28660823 is an apocalyptic number.

28660823 is a deficient number, since it is larger than the sum of its proper divisors (44545).

28660823 is an equidigital number, since it uses as much as digits as its factorization.

28660823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44544.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 28660823 is about 5353.5803907292. The cubic root of 28660823 is about 306.0292131821.

The spelling of 28660823 in words is "twenty-eight million, six hundred sixty thousand, eight hundred twenty-three".