28284717 has 4 divisors (see below), whose sum is σ = 37712960. Its totient is φ = 18856476.

The previous prime is 28284713. The next prime is 28284721. The reversal of 28284717 is 71748282.

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.

It is an interprime number because it is at equal distance from previous prime (28284713) and next prime (28284721).

It is not a de Polignac number, because 28284717 - 2² = 28284713 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 (28284713) 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, 4714117 + ... + 4714122.

It is an arithmetic number, because the mean of its divisors is an integer number (9428240).

Almost surely, 2^28284717 is an apocalyptic number.

It is an amenable number.

28284717 is a deficient number, since it is larger than the sum of its proper divisors (9428243).

28284717 is an equidigital number, since it uses as much as digits as its factorization.

28284717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9428242.

The product of its digits is 50176, while the sum is 39.

The square root of 28284717 is about 5318.3378042392. The cubic root of 28284717 is about 304.6846763552.

The spelling of 28284717 in words is "twenty-eight million, two hundred eighty-four thousand, seven hundred seventeen".