28857263 has 4 divisors (see below), whose sum is σ = 28869600. Its totient is φ = 28844928.

The previous prime is 28857247. The next prime is 28857287. The reversal of 28857263 is 36275882.

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, and also an emirpimes, since its reverse is a distinct semiprime: 36275882 = 2 ⋅18137941.

It is a cyclic number.

It is not a de Polignac number, because 28857263 - 2⁴ = 28857247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28857263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28853263) 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, 1463 + ... + 7736.

It is an arithmetic number, because the mean of its divisors is an integer number (7217400).

Almost surely, 2^28857263 is an apocalyptic number.

28857263 is a deficient number, since it is larger than the sum of its proper divisors (12337).

28857263 is an equidigital number, since it uses as much as digits as its factorization.

28857263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12336.

The product of its digits is 161280, while the sum is 41.

The square root of 28857263 is about 5371.8956616822. The cubic root of 28857263 is about 306.7267920600.

The spelling of 28857263 in words is "twenty-eight million, eight hundred fifty-seven thousand, two hundred sixty-three".