28338217 has 4 divisors (see below), whose sum is σ = 28352896. Its totient is φ = 28323540.

The previous prime is 28338187. The next prime is 28338229. The reversal of 28338217 is 71283382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71283382 = 2 ⋅35641691.

It is a cyclic number.

It is not a de Polignac number, because 28338217 - 2¹¹ = 28336169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28338917) 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, 3909 + ... + 8482.

It is an arithmetic number, because the mean of its divisors is an integer number (7088224).

Almost surely, 2^28338217 is an apocalyptic number.

It is an amenable number.

28338217 is a deficient number, since it is larger than the sum of its proper divisors (14679).

28338217 is a wasteful number, since it uses less digits than its factorization.

28338217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14678.

The product of its digits is 16128, while the sum is 34.

The square root of 28338217 is about 5323.3651950622. The cubic root of 28338217 is about 304.8766571049.

The spelling of 28338217 in words is "twenty-eight million, three hundred thirty-eight thousand, two hundred seventeen".