8666784 has 96 divisors (see below), whose sum is σ = 28909440. Its totient is φ = 2474496.

The previous prime is 8666783. The next prime is 8666797. The reversal of 8666784 is 4876668.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×8666784² = 150226289805312, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (8666783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5332 + ... + 6764.

It is an arithmetic number, because the mean of its divisors is an integer number (301140).

Almost surely, 2^8666784 is an apocalyptic number.

8666784 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8666784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14454720).

8666784 is an abundant number, since it is smaller than the sum of its proper divisors (20242656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8666784 is a wasteful number, since it uses less digits than its factorization.

8666784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459 (or 1445 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 8666784 is about 2943.9402167843. The cubic root of 8666784 is about 205.4089318902.

The spelling of 8666784 in words is "eight million, six hundred sixty-six thousand, seven hundred eighty-four".