28253663 has 4 divisors (see below), whose sum is σ = 28265688. Its totient is φ = 28241640.

The previous prime is 28253653. The next prime is 28253689. The reversal of 28253663 is 36635282.

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 is a cyclic number.

It is not a de Polignac number, because 28253663 - 2¹⁸ = 27991519 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 (28253653) 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, 1208 + ... + 7613.

It is an arithmetic number, because the mean of its divisors is an integer number (7066422).

Almost surely, 2^28253663 is an apocalyptic number.

28253663 is a deficient number, since it is larger than the sum of its proper divisors (12025).

28253663 is an equidigital number, since it uses as much as digits as its factorization.

28253663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12024.

The product of its digits is 51840, while the sum is 35.

The square root of 28253663 is about 5315.4174812521. The cubic root of 28253663 is about 304.5731303362.

The spelling of 28253663 in words is "twenty-eight million, two hundred fifty-three thousand, six hundred sixty-three".