8428784 has 60 divisors (see below), whose sum is σ = 20483064. Its totient is φ = 3330432.

The previous prime is 8428769. The next prime is 8428789. The reversal of 8428784 is 4878248.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8428789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9779 + ... + 10605.

Almost surely, 2^8428784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8428784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10241532).

8428784 is an abundant number, since it is smaller than the sum of its proper divisors (12054280).

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

8428784 is a wasteful number, since it uses less digits than its factorization.

8428784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 849 counting only the distinct ones).

The product of its digits is 114688, while the sum is 41.

The square root of 8428784 is about 2903.2368143160. The cubic root of 8428784 is about 203.5111967551.

The spelling of 8428784 in words is "eight million, four hundred twenty-eight thousand, seven hundred eighty-four".