8566640 has 40 divisors (see below), whose sum is σ = 21092400. Its totient is φ = 3224576.

The previous prime is 8566639. The next prime is 8566651. The reversal of 8566640 is 466658.

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

It is a self number, because there is not a number n which added to its sum of digits gives 8566640.

It is a congruent number.

It is an unprimeable number.

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, 1790 + ... + 4509.

It is an arithmetic number, because the mean of its divisors is an integer number (527310).

Almost surely, 2^8566640 is an apocalyptic number.

8566640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8566640 is an abundant number, since it is smaller than the sum of its proper divisors (12525760).

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

8566640 is a wasteful number, since it uses less digits than its factorization.

8566640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6329 (or 6323 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 8566640 is about 2926.8823003326. The cubic root of 8566640 is about 204.6147036162.

It can be divided in two parts, 85 and 66640, that multiplied together give a square (5664400 = 2380²).

The spelling of 8566640 in words is "eight million, five hundred sixty-six thousand, six hundred forty".