8686240 has 36 divisors (see below), whose sum is σ = 20609694. Its totient is φ = 3459584.

The previous prime is 8686213. The next prime is 8686241. The reversal of 8686240 is 426868.

It can be written as a sum of positive squares in 3 ways, for example, as 4376464 + 4309776 = 2092^2 + 2076^2 .

It is a d-powerful number, because it can be written as 8 + 6⁴ + 8 + 6⁷ + 2²³ + 4⁷ + 0 .

It is a junction number, because it is equal to n+sod(n) for n = 8686196 and 8686205.

It is not an unprimeable number, because it can be changed into a prime (8686241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37164 + ... + 37396.

Almost surely, 2^8686240 is an apocalyptic number.

8686240 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 8686240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10304847).

8686240 is an abundant number, since it is smaller than the sum of its proper divisors (11923454).

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

8686240 is an equidigital number, since it uses as much as digits as its factorization.

8686240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 8686240 is about 2947.2427792769. The cubic root of 8686240 is about 205.5625240177.

The spelling of 8686240 in words is "eight million, six hundred eighty-six thousand, two hundred forty".