28144717 has 4 divisors (see below), whose sum is σ = 28156480. Its totient is φ = 28132956.

The previous prime is 28144691. The next prime is 28144723. The reversal of 28144717 is 71744182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28144717 - 2²³ = 19756109 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 (28144817) 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, 867 + ... + 7552.

It is an arithmetic number, because the mean of its divisors is an integer number (7039120).

Almost surely, 2^28144717 is an apocalyptic number.

It is an amenable number.

28144717 is a deficient number, since it is larger than the sum of its proper divisors (11763).

28144717 is an equidigital number, since it uses as much as digits as its factorization.

28144717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11762.

The product of its digits is 12544, while the sum is 34.

The square root of 28144717 is about 5305.1594697992. The cubic root of 28144717 is about 304.1811485276.

Adding to 28144717 its reverse (71744182), we get a palindrome (99888899).

The spelling of 28144717 in words is "twenty-eight million, one hundred forty-four thousand, seven hundred seventeen".