28442517 has 4 divisors (see below), whose sum is σ = 37923360. Its totient is φ = 18961676.

The previous prime is 28442497. The next prime is 28442537. The reversal of 28442517 is 71524482.

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.

It is an interprime number because it is at equal distance from previous prime (28442497) and next prime (28442537).

It is a cyclic number.

It is not a de Polignac number, because 28442517 - 2¹¹ = 28440469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28442537) 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, 4740417 + ... + 4740422.

It is an arithmetic number, because the mean of its divisors is an integer number (9480840).

Almost surely, 2^28442517 is an apocalyptic number.

It is an amenable number.

28442517 is a deficient number, since it is larger than the sum of its proper divisors (9480843).

28442517 is an equidigital number, since it uses as much as digits as its factorization.

28442517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9480842.

The product of its digits is 17920, while the sum is 33.

The square root of 28442517 is about 5333.1526323555. The cubic root of 28442517 is about 305.2502362759.

Adding to 28442517 its reverse (71524482), we get a palindrome (99966999).

The spelling of 28442517 in words is "twenty-eight million, four hundred forty-two thousand, five hundred seventeen".