28122717 has 24 divisors (see below), whose sum is σ = 45919200. Its totient is φ = 15222816.

The previous prime is 28122691. The next prime is 28122727. The reversal of 28122717 is 71722182.

It is a happy number.

It is not a de Polignac number, because 28122717 - 2¹⁵ = 28089949 is a prime.

It is a super-2 number, since 2×28122717² = 1581774422924178, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28122727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2242 + ... + 7827.

It is an arithmetic number, because the mean of its divisors is an integer number (1913300).

Almost surely, 2^28122717 is an apocalyptic number.

It is an amenable number.

28122717 is a deficient number, since it is larger than the sum of its proper divisors (17796483).

28122717 is a wasteful number, since it uses less digits than its factorization.

28122717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10105 (or 10098 counting only the distinct ones).

The product of its digits is 3136, while the sum is 30.

The square root of 28122717 is about 5303.0856112267. The cubic root of 28122717 is about 304.1018710125.

Adding to 28122717 its reverse (71722182), we get a palindrome (99844899).

The spelling of 28122717 in words is "twenty-eight million, one hundred twenty-two thousand, seven hundred seventeen".