28787323 has 4 divisors (see below), whose sum is σ = 29072448. Its totient is φ = 28502200.

The previous prime is 28787309. The next prime is 28787327. The reversal of 28787323 is 32378782.

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

It is a de Polignac number, because none of the positive numbers 2^k-28787323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28787327) 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, 142411 + ... + 142612.

It is an arithmetic number, because the mean of its divisors is an integer number (7268112).

Almost surely, 2^28787323 is an apocalyptic number.

28787323 is a deficient number, since it is larger than the sum of its proper divisors (285125).

28787323 is a wasteful number, since it uses less digits than its factorization.

28787323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285124.

The product of its digits is 112896, while the sum is 40.

The square root of 28787323 is about 5365.3819062579. The cubic root of 28787323 is about 306.4787917983.

It can be divided in two parts, 2878 and 7323, that added together give a palindrome (10201).

The spelling of 28787323 in words is "twenty-eight million, seven hundred eighty-seven thousand, three hundred twenty-three".