8209864 has 16 divisors (see below), whose sum is σ = 16577820. Its totient is φ = 3789120.

The previous prime is 8209849. The next prime is 8209867. The reversal of 8209864 is 4689028.

It can be written as a sum of positive squares in 2 ways, for example, as 7064964 + 1144900 = 2658^2 + 1070^2 .

It is not an unprimeable number, because it can be changed into a prime (8209867) 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, 39367 + ... + 39574.

Almost surely, 2^8209864 is an apocalyptic number.

It is an amenable number.

8209864 is an abundant number, since it is smaller than the sum of its proper divisors (8367956).

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

8209864 is a wasteful number, since it uses less digits than its factorization.

8209864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78960 (or 78956 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 8209864 is about 2865.2860241170. The cubic root of 8209864 is about 201.7337930430.

The spelling of 8209864 in words is "eight million, two hundred nine thousand, eight hundred sixty-four".