28356253 has 4 divisors (see below), whose sum is σ = 28367100. Its totient is φ = 28345408.

The previous prime is 28356199. The next prime is 28356269. The reversal of 28356253 is 35265382.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 22071204 + 6285049 = 4698^2 + 2507^2 .

It is a cyclic number.

It is not a de Polignac number, because 28356253 - 2¹⁷ = 28225181 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 (28356283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1173 + ... + 7621.

It is an arithmetic number, because the mean of its divisors is an integer number (7091775).

Almost surely, 2^28356253 is an apocalyptic number.

It is an amenable number.

28356253 is a deficient number, since it is larger than the sum of its proper divisors (10847).

28356253 is an equidigital number, since it uses as much as digits as its factorization.

28356253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10846.

The product of its digits is 43200, while the sum is 34.

The square root of 28356253 is about 5325.0589668097. The cubic root of 28356253 is about 304.9413234791.

The spelling of 28356253 in words is "twenty-eight million, three hundred fifty-six thousand, two hundred fifty-three".