8686799209 has 27 divisors (see below), whose sum is σ = 9856376901. Its totient is φ = 7650102240.

The previous prime is 8686799203. The next prime is 8686799243. The reversal of 8686799209 is 9029976868.

It is a happy number.

The square root of 8686799209 is 93203.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 5954437225 + 2732361984 = 77165^2 + 52272^2 .

It is not a de Polignac number, because 8686799209 - 2³ = 8686799201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8686799201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 37933507 + ... + 37933735.

Almost surely, 2^8686799209 is an apocalyptic number.

8686799209 is the 93203-rd square number.

8686799209 is the 46602-nd centered octagonal number.

It is an amenable number.

8686799209 is a deficient number, since it is larger than the sum of its proper divisors (1169577692).

8686799209 is an equidigital number, since it uses as much as digits as its factorization.

8686799209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 64.

The cubic root of 8686799209 is about 2055.6693520704.

Multiplying 8686799209 by its sum of digits (64), we get a square (555955149376 = 745624²).

The spelling of 8686799209 in words is "eight billion, six hundred eighty-six million, seven hundred ninety-nine thousand, two hundred nine".