28523081 has 2 divisors, whose sum is σ = 28523082. Its totient is φ = 28523080.

The previous prime is 28522993. The next prime is 28523083. The reversal of 28523081 is 18032582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14899600 + 13623481 = 3860^2 + 3691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28523081 is a prime.

It is a super-2 number, since 2×28523081² = 1627132299465122, which contains 22 as substring.

Together with 28523083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28523083) 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, 14261540 + 14261541.

It is an arithmetic number, because the mean of its divisors is an integer number (14261541).

Almost surely, 2^28523081 is an apocalyptic number.

It is an amenable number.

28523081 is a deficient number, since it is larger than the sum of its proper divisors (1).

28523081 is an equidigital number, since it uses as much as digits as its factorization.

28523081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 28523081 is about 5340.7004222293. The cubic root of 28523081 is about 305.5381737232.

The spelling of 28523081 in words is "twenty-eight million, five hundred twenty-three thousand, eighty-one".