28285513 has 2 divisors, whose sum is σ = 28285514. Its totient is φ = 28285512.

The previous prime is 28285511. The next prime is 28285541. The reversal of 28285513 is 31558282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22963264 + 5322249 = 4792^2 + 2307^2 .

It is a cyclic number.

It is not a de Polignac number, because 28285513 - 2¹ = 28285511 is a prime.

Together with 28285511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28285511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14142756 + 14142757.

It is an arithmetic number, because the mean of its divisors is an integer number (14142757).

Almost surely, 2^28285513 is an apocalyptic number.

It is an amenable number.

28285513 is a deficient number, since it is larger than the sum of its proper divisors (1).

28285513 is an equidigital number, since it uses as much as digits as its factorization.

28285513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 34.

The square root of 28285513 is about 5318.4126391246. The cubic root of 28285513 is about 304.6875345150.

The spelling of 28285513 in words is "twenty-eight million, two hundred eighty-five thousand, five hundred thirteen".