9866564 has 12 divisors (see below), whose sum is σ = 17293500. Its totient is φ = 4925568.

The previous prime is 9866561. The next prime is 9866573. The reversal of 9866564 is 4656689.

It can be written as a sum of positive squares in 2 ways, for example, as 4840000 + 5026564 = 2200^2 + 2242^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9866561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1712 + ... + 4760.

It is an arithmetic number, because the mean of its divisors is an integer number (1441125).

Almost surely, 2^9866564 is an apocalyptic number.

It is an amenable number.

9866564 is a deficient number, since it is larger than the sum of its proper divisors (7426936).

9866564 is a wasteful number, since it uses less digits than its factorization.

9866564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3862 (or 3860 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The square root of 9866564 is about 3141.1087214549. The cubic root of 9866564 is about 214.4809110689.

The spelling of 9866564 in words is "nine million, eight hundred sixty-six thousand, five hundred sixty-four".