28233217 has 2 divisors, whose sum is σ = 28233218. Its totient is φ = 28233216.

The previous prime is 28233199. The next prime is 28233223. The reversal of 28233217 is 71233282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26532801 + 1700416 = 5151^2 + 1304^2 .

It is a cyclic number.

It is not a de Polignac number, because 28233217 - 2¹⁵ = 28200449 is a prime.

It is a super-2 number, since 2×28233217² = 1594229084338178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28233017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14116608 + 14116609.

It is an arithmetic number, because the mean of its divisors is an integer number (14116609).

Almost surely, 2^28233217 is an apocalyptic number.

It is an amenable number.

28233217 is a deficient number, since it is larger than the sum of its proper divisors (1).

28233217 is an equidigital number, since it uses as much as digits as its factorization.

28233217 is an evil number, because the sum of its binary digits is even.

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

The square root of 28233217 is about 5313.4938599758. The cubic root of 28233217 is about 304.4996436409.

Adding to 28233217 its reverse (71233282), we get a palindrome (99466499).

The spelling of 28233217 in words is "twenty-eight million, two hundred thirty-three thousand, two hundred seventeen".