28161717 has 4 divisors (see below), whose sum is σ = 37548960. Its totient is φ = 18774476.

The previous prime is 28161701. The next prime is 28161767. The reversal of 28161717 is 71716182.

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 a cyclic number.

It is not a de Polignac number, because 28161717 - 2⁴ = 28161701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28161767) 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, 4693617 + ... + 4693622.

It is an arithmetic number, because the mean of its divisors is an integer number (9387240).

Almost surely, 2^28161717 is an apocalyptic number.

It is an amenable number.

28161717 is a deficient number, since it is larger than the sum of its proper divisors (9387243).

28161717 is an equidigital number, since it uses as much as digits as its factorization.

28161717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9387242.

The product of its digits is 4704, while the sum is 33.

The square root of 28161717 is about 5306.7614417835. The cubic root of 28161717 is about 304.2423801343.

Adding to 28161717 its reverse (71716182), we get a palindrome (99877899).

The spelling of 28161717 in words is "twenty-eight million, one hundred sixty-one thousand, seven hundred seventeen".