28565513 has 2 divisors, whose sum is σ = 28565514. Its totient is φ = 28565512.

The previous prime is 28565503. The next prime is 28565533. The reversal of 28565513 is 31556582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19963024 + 8602489 = 4468^2 + 2933^2 .

It is a cyclic number.

It is not a de Polignac number, because 28565513 - 2²² = 24371209 is a prime.

It is not a weakly prime, because it can be changed into another prime (28565503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14282756 + 14282757.

It is an arithmetic number, because the mean of its divisors is an integer number (14282757).

Almost surely, 2^28565513 is an apocalyptic number.

It is an amenable number.

28565513 is a deficient number, since it is larger than the sum of its proper divisors (1).

28565513 is an equidigital number, since it uses as much as digits as its factorization.

28565513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36000, while the sum is 35.

The square root of 28565513 is about 5344.6714585651. The cubic root of 28565513 is about 305.6896086520.

The spelling of 28565513 in words is "twenty-eight million, five hundred sixty-five thousand, five hundred thirteen".