28087823 has 2 divisors, whose sum is σ = 28087824. Its totient is φ = 28087822.

The previous prime is 28087819. The next prime is 28087831. The reversal of 28087823 is 32878082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28087823 - 2² = 28087819 is a prime.

It is equal to p_1746578 and since 28087823 and 1746578 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28077823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14043911 + 14043912.

It is an arithmetic number, because the mean of its divisors is an integer number (14043912).

Almost surely, 2^28087823 is an apocalyptic number.

28087823 is a deficient number, since it is larger than the sum of its proper divisors (1).

28087823 is an equidigital number, since it uses as much as digits as its factorization.

28087823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 28087823 is about 5299.7946186621. The cubic root of 28087823 is about 303.9760448287.

The spelling of 28087823 in words is "twenty-eight million, eighty-seven thousand, eight hundred twenty-three".