28256763 has 4 divisors (see below), whose sum is σ = 37675688. Its totient is φ = 18837840.

The previous prime is 28256741. The next prime is 28256773. The reversal of 28256763 is 36765282.

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

It is not a de Polignac number, because 28256763 - 2⁸ = 28256507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28256713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4709458 + ... + 4709463.

It is an arithmetic number, because the mean of its divisors is an integer number (9418922).

Almost surely, 2^28256763 is an apocalyptic number.

28256763 is a deficient number, since it is larger than the sum of its proper divisors (9418925).

28256763 is an equidigital number, since it uses as much as digits as its factorization.

28256763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9418924.

The product of its digits is 120960, while the sum is 39.

The square root of 28256763 is about 5315.7090778183. The cubic root of 28256763 is about 304.5842692125.

The spelling of 28256763 in words is "twenty-eight million, two hundred fifty-six thousand, seven hundred sixty-three".