28288783 has 4 divisors (see below), whose sum is σ = 28890720. Its totient is φ = 27686848.

The previous prime is 28288769. The next prime is 28288823. The reversal of 28288783 is 38788282.

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 28288783 - 2⁵ = 28288751 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 (28288703) 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, 300898 + ... + 300991.

It is an arithmetic number, because the mean of its divisors is an integer number (7222680).

Almost surely, 2^28288783 is an apocalyptic number.

28288783 is a deficient number, since it is larger than the sum of its proper divisors (601937).

28288783 is an equidigital number, since it uses as much as digits as its factorization.

28288783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601936.

The product of its digits is 344064, while the sum is 46.

The square root of 28288783 is about 5318.7200527947. The cubic root of 28288783 is about 304.6992753880.

It can be divided in two parts, 2828 and 8783, that added together give a palindrome (11611).

The spelling of 28288783 in words is "twenty-eight million, two hundred eighty-eight thousand, seven hundred eighty-three".