28227817 has 4 divisors (see below), whose sum is σ = 29201220. Its totient is φ = 27254416.

The previous prime is 28227799. The next prime is 28227821. The reversal of 28227817 is 71872282.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9357481 + 18870336 = 3059^2 + 4344^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28227817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28227847) 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, 486658 + ... + 486715.

It is an arithmetic number, because the mean of its divisors is an integer number (7300305).

Almost surely, 2^28227817 is an apocalyptic number.

It is an amenable number.

28227817 is a deficient number, since it is larger than the sum of its proper divisors (973403).

28227817 is an equidigital number, since it uses as much as digits as its factorization.

28227817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973402.

The product of its digits is 25088, while the sum is 37.

The square root of 28227817 is about 5312.9856954447. The cubic root of 28227817 is about 304.4802291227.

The spelling of 28227817 in words is "twenty-eight million, two hundred twenty-seven thousand, eight hundred seventeen".