28087469 has 2 divisors, whose sum is σ = 28087470. Its totient is φ = 28087468.

The previous prime is 28087463. The next prime is 28087487. The reversal of 28087469 is 96478082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25381444 + 2706025 = 5038^2 + 1645^2 .

It is a cyclic number.

It is not a de Polignac number, because 28087469 - 2¹² = 28083373 is a prime.

It is a super-2 number, since 2×28087469² = 1577811829651922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28087463) 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, 14043734 + 14043735.

It is an arithmetic number, because the mean of its divisors is an integer number (14043735).

Almost surely, 2^28087469 is an apocalyptic number.

It is an amenable number.

28087469 is a deficient number, since it is larger than the sum of its proper divisors (1).

28087469 is an equidigital number, since it uses as much as digits as its factorization.

28087469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 28087469 is about 5299.7612210363. The cubic root of 28087469 is about 303.9747677869.

The spelling of 28087469 in words is "twenty-eight million, eighty-seven thousand, four hundred sixty-nine".