8866640 has 40 divisors (see below), whose sum is σ = 20791080. Its totient is φ = 3516416.

The previous prime is 8866633. The next prime is 8866657. The reversal of 8866640 is 466688.

It can be written as a sum of positive squares in 4 ways, for example, as 2676496 + 6190144 = 1636^2 + 2488^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 8866594 and 8866603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10556 + ... + 11364.

It is an arithmetic number, because the mean of its divisors is an integer number (519777).

Almost surely, 2^8866640 is an apocalyptic number.

8866640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8866640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10395540).

8866640 is an abundant number, since it is smaller than the sum of its proper divisors (11924440).

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

8866640 is a wasteful number, since it uses less digits than its factorization.

8866640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959 (or 953 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 8866640 is about 2977.6903801436. The cubic root of 8866640 is about 206.9758581537.

The spelling of 8866640 in words is "eight million, eight hundred sixty-six thousand, six hundred forty".