8809640 has 64 divisors (see below), whose sum is σ = 23016960. Its totient is φ = 2972160.

The previous prime is 8809639. The next prime is 8809651. The reversal of 8809640 is 469088.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 8809640.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20225 + ... + 20655.

It is an arithmetic number, because the mean of its divisors is an integer number (359640).

Almost surely, 2^8809640 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 8809640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11508480).

8809640 is an abundant number, since it is smaller than the sum of its proper divisors (14207320).

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

8809640 is a wasteful number, since it uses less digits than its factorization.

8809640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 8809640 is about 2968.1037717708. The cubic root of 8809640 is about 206.5313833097.

It can be divided in two parts, 8809 and 640, that added together give a palindrome (9449).

The spelling of 8809640 in words is "eight million, eight hundred nine thousand, six hundred forty".