28393217 has 8 divisors (see below), whose sum is σ = 29120256. Its totient is φ = 27671392.

The previous prime is 28393207. The next prime is 28393223. The reversal of 28393217 is 71239382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28393217 - 2²⁴ = 11616001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28393207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11213 + ... + 13509.

It is an arithmetic number, because the mean of its divisors is an integer number (3640032).

Almost surely, 2^28393217 is an apocalyptic number.

It is an amenable number.

28393217 is a deficient number, since it is larger than the sum of its proper divisors (727039).

28393217 is a wasteful number, since it uses less digits than its factorization.

28393217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2607.

The product of its digits is 18144, while the sum is 35.

The square root of 28393217 is about 5328.5285961511. The cubic root of 28393217 is about 305.0737687730.

The spelling of 28393217 in words is "twenty-eight million, three hundred ninety-three thousand, two hundred seventeen".