28323217 has 6 divisors (see below), whose sum is σ = 30669702. Its totient is φ = 26144352.

The previous prime is 28323209. The next prime is 28323277. The reversal of 28323217 is 71232382.

It can be written as a sum of positive squares in 3 ways, for example, as 1324801 + 26998416 = 1151^2 + 5196^2 .

It is not a de Polignac number, because 28323217 - 2³ = 28323209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28323277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 83628 + ... + 83965.

It is an arithmetic number, because the mean of its divisors is an integer number (5111617).

Almost surely, 2^28323217 is an apocalyptic number.

It is an amenable number.

28323217 is a deficient number, since it is larger than the sum of its proper divisors (2346485).

28323217 is a wasteful number, since it uses less digits than its factorization.

28323217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167619 (or 167606 counting only the distinct ones).

The product of its digits is 4032, while the sum is 28.

The square root of 28323217 is about 5321.9561253359. The cubic root of 28323217 is about 304.8228551199.

Adding to 28323217 its reverse (71232382), we get a palindrome (99555599).

The spelling of 28323217 in words is "twenty-eight million, three hundred twenty-three thousand, two hundred seventeen".