28005253 has 4 divisors (see below), whose sum is σ = 28533708. Its totient is φ = 27476800.

The previous prime is 28005247. The next prime is 28005269. The reversal of 28005253 is 35250082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24383844 + 3621409 = 4938^2 + 1903^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28005253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28005203) 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 in 3 ways as a sum of consecutive naturals, for example, 264148 + ... + 264253.

It is an arithmetic number, because the mean of its divisors is an integer number (7133427).

Almost surely, 2^28005253 is an apocalyptic number.

It is an amenable number.

28005253 is a deficient number, since it is larger than the sum of its proper divisors (528455).

28005253 is an equidigital number, since it uses as much as digits as its factorization.

28005253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528454.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 28005253 is about 5291.9989606953. The cubic root of 28005253 is about 303.6778855262.

The spelling of 28005253 in words is "twenty-eight million, five thousand, two hundred fifty-three".