28822517 has 4 divisors (see below), whose sum is σ = 29217420. Its totient is φ = 28427616.

The previous prime is 28822511. The next prime is 28822537. The reversal of 28822517 is 71522882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71522882 = 2 ⋅35761441.

It can be written as a sum of positive squares in 2 ways, for example, as 17255716 + 11566801 = 4154^2 + 3401^2 .

It is a cyclic number.

It is not a de Polignac number, because 28822517 - 2⁴ = 28822501 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 (28822511) 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, 197342 + ... + 197487.

It is an arithmetic number, because the mean of its divisors is an integer number (7304355).

Almost surely, 2^28822517 is an apocalyptic number.

It is an amenable number.

28822517 is a deficient number, since it is larger than the sum of its proper divisors (394903).

28822517 is an equidigital number, since it uses as much as digits as its factorization.

28822517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394902.

The product of its digits is 17920, while the sum is 35.

The square root of 28822517 is about 5368.6606337149. The cubic root of 28822517 is about 306.6036363582.

The spelling of 28822517 in words is "twenty-eight million, eight hundred twenty-two thousand, five hundred seventeen".