28668253 has 8 divisors (see below), whose sum is σ = 29082872. Its totient is φ = 28256256.

The previous prime is 28668247. The next prime is 28668257. The reversal of 28668253 is 35286682.

It can be written as a sum of positive squares in 4 ways, for example, as 5116644 + 23551609 = 2262^2 + 4853^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28668253 - 2⁵ = 28668221 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 (28668257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32251 + ... + 33127.

It is an arithmetic number, because the mean of its divisors is an integer number (3635359).

Almost surely, 2^28668253 is an apocalyptic number.

It is an amenable number.

28668253 is a deficient number, since it is larger than the sum of its proper divisors (414619).

28668253 is an equidigital number, since it uses as much as digits as its factorization.

28668253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311.

The product of its digits is 138240, while the sum is 40.

The square root of 28668253 is about 5354.2742738862. The cubic root of 28668253 is about 306.0556557886.

The spelling of 28668253 in words is "twenty-eight million, six hundred sixty-eight thousand, two hundred fifty-three".