28866317 has 4 divisors (see below), whose sum is σ = 29261820. Its totient is φ = 28470816.

The previous prime is 28866307. The next prime is 28866329. The reversal of 28866317 is 71366882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71366882 = 2 ⋅35683441.

It can be written as a sum of positive squares in 2 ways, for example, as 14945956 + 13920361 = 3866^2 + 3731^2 .

It is a cyclic number.

It is not a de Polignac number, because 28866317 - 2¹⁶ = 28800781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28866307) 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, 197642 + ... + 197787.

It is an arithmetic number, because the mean of its divisors is an integer number (7315455).

Almost surely, 2^28866317 is an apocalyptic number.

It is an amenable number.

28866317 is a deficient number, since it is larger than the sum of its proper divisors (395503).

28866317 is an equidigital number, since it uses as much as digits as its factorization.

28866317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395502.

The product of its digits is 96768, while the sum is 41.

The square root of 28866317 is about 5372.7383148633. The cubic root of 28866317 is about 306.7588673355.

The spelling of 28866317 in words is "twenty-eight million, eight hundred sixty-six thousand, three hundred seventeen".