28140263 has 4 divisors (see below), whose sum is σ = 28739040. Its totient is φ = 27541488.

The previous prime is 28140199. The next prime is 28140269. The reversal of 28140263 is 36204182.

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

It is a cyclic number.

It is not a de Polignac number, because 28140263 - 2⁶ = 28140199 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 (28140269) 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, 299318 + ... + 299411.

It is an arithmetic number, because the mean of its divisors is an integer number (7184760).

Almost surely, 2^28140263 is an apocalyptic number.

28140263 is a deficient number, since it is larger than the sum of its proper divisors (598777).

28140263 is an equidigital number, since it uses as much as digits as its factorization.

28140263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598776.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 28140263 is about 5304.7396731602. The cubic root of 28140263 is about 304.1651017705.

The spelling of 28140263 in words is "twenty-eight million, one hundred forty thousand, two hundred sixty-three".