28814873 has 4 divisors (see below), whose sum is σ = 28860468. Its totient is φ = 28769280.

The previous prime is 28814869. The next prime is 28814879. The reversal of 28814873 is 37841882.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27962944 + 851929 = 5288^2 + 923^2 .

It is a cyclic number.

It is not a de Polignac number, because 28814873 - 2² = 28814869 is a prime.

It is a super-2 number, since 2×28814873² = 1660593812012258, which contains 22 as substring.

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 28814873.

It is not an unprimeable number, because it can be changed into a prime (28814879) 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, 21836 + ... + 23117.

It is an arithmetic number, because the mean of its divisors is an integer number (7215117).

Almost surely, 2^28814873 is an apocalyptic number.

It is an amenable number.

28814873 is a deficient number, since it is larger than the sum of its proper divisors (45595).

28814873 is an equidigital number, since it uses as much as digits as its factorization.

28814873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45594.

The product of its digits is 86016, while the sum is 41.

The square root of 28814873 is about 5367.9486771019. The cubic root of 28814873 is about 306.5765292482.

The spelling of 28814873 in words is "twenty-eight million, eight hundred fourteen thousand, eight hundred seventy-three".