28307569 has 2 divisors, whose sum is σ = 28307570. Its totient is φ = 28307568.

The previous prime is 28307527. The next prime is 28307611. The reversal of 28307569 is 96570382.

It is a balanced prime because it is at equal distance from previous prime (28307527) and next prime (28307611).

It can be written as a sum of positive squares in only one way, i.e., 27699169 + 608400 = 5263^2 + 780^2 .

It is a cyclic number.

It is not a de Polignac number, because 28307569 - 2⁷ = 28307441 is a prime.

It is a super-2 number, since 2×28307569² = 1602636925379522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28307269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14153784 + 14153785.

It is an arithmetic number, because the mean of its divisors is an integer number (14153785).

Almost surely, 2^28307569 is an apocalyptic number.

It is an amenable number.

28307569 is a deficient number, since it is larger than the sum of its proper divisors (1).

28307569 is an equidigital number, since it uses as much as digits as its factorization.

28307569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 28307569 is about 5320.4857860913. The cubic root of 28307569 is about 304.7667086409.

The spelling of 28307569 in words is "twenty-eight million, three hundred seven thousand, five hundred sixty-nine".