8643128 has 32 divisors (see below), whose sum is σ = 17886960. Its totient is φ = 3889920.

The previous prime is 8643121. The next prime is 8643133. The reversal of 8643128 is 8213468.

It is a junction number, because it is equal to n+sod(n) for n = 8643094 and 8643103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8643121) 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, 3251 + ... + 5277.

Almost surely, 2^8643128 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 8643128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8943480).

8643128 is an abundant number, since it is smaller than the sum of its proper divisors (9243832).

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

8643128 is a wasteful number, since it uses less digits than its factorization.

8643128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2087 (or 2083 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 8643128 is about 2939.9197267953. The cubic root of 8643128 is about 205.2218735984.

The spelling of 8643128 in words is "eight million, six hundred forty-three thousand, one hundred twenty-eight".