28304569 has 2 divisors, whose sum is σ = 28304570. Its totient is φ = 28304568.

The previous prime is 28304567. The next prime is 28304641. The reversal of 28304569 is 96540382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18147600 + 10156969 = 4260^2 + 3187^2 .

It is a cyclic number.

It is not a de Polignac number, because 28304569 - 2¹ = 28304567 is a prime.

It is a super-2 number, since 2×28304569² = 1602297252551522, which contains 22 as substring.

Together with 28304567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28304567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14152284 + 14152285.

It is an arithmetic number, because the mean of its divisors is an integer number (14152285).

Almost surely, 2^28304569 is an apocalyptic number.

It is an amenable number.

28304569 is a deficient number, since it is larger than the sum of its proper divisors (1).

28304569 is an equidigital number, since it uses as much as digits as its factorization.

28304569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 28304569 is about 5320.2038494780. The cubic root of 28304569 is about 304.7559419984.

The spelling of 28304569 in words is "twenty-eight million, three hundred four thousand, five hundred sixty-nine".