8644440 has 128 divisors (see below), whose sum is σ = 30481920. Its totient is φ = 1920000.

The previous prime is 8644439. The next prime is 8644451. The reversal of 8644440 is 444468.

8644440 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 8644398 and 8644407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34315 + ... + 34565.

It is an arithmetic number, because the mean of its divisors is an integer number (238140).

Almost surely, 2^8644440 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 8644440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15240960).

8644440 is an abundant number, since it is smaller than the sum of its proper divisors (21837480).

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

8644440 is a wasteful number, since it uses less digits than its factorization.

8644440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 30.

The square root of 8644440 is about 2940.1428536722. The cubic root of 8644440 is about 205.2322570875.

The spelling of 8644440 in words is "eight million, six hundred forty-four thousand, four hundred forty".