8644432 has 40 divisors (see below), whose sum is σ = 18059112. Its totient is φ = 3993600.

The previous prime is 8644397. The next prime is 8644439. The reversal of 8644432 is 2344468.

It can be written as a sum of positive squares in 4 ways, for example, as 141376 + 8503056 = 376^2 + 2916^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 8644394 and 8644403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8644439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16332 + ... + 16852.

Almost surely, 2^8644432 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 8644432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9029556).

8644432 is an abundant number, since it is smaller than the sum of its proper divisors (9414680).

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

8644432 is a wasteful number, since it uses less digits than its factorization.

8644432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607 (or 601 counting only the distinct ones).

The product of its digits is 18432, while the sum is 31.

The square root of 8644432 is about 2940.1414931938. The cubic root of 8644432 is about 205.2321937767.

The spelling of 8644432 in words is "eight million, six hundred forty-four thousand, four hundred thirty-two".