686004509 has 8 divisors (see below), whose sum is σ = 716115840. Its totient is φ = 655916976.

The previous prime is 686004469. The next prime is 686004523. The reversal of 686004509 is 905400686.

686004509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 686004509 - 2²⁰ = 684955933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686004559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78827 + ... + 87095.

It is an arithmetic number, because the mean of its divisors is an integer number (89514480).

Almost surely, 2^686004509 is an apocalyptic number.

It is an amenable number.

686004509 is a deficient number, since it is larger than the sum of its proper divisors (30111331).

686004509 is a wasteful number, since it uses less digits than its factorization.

686004509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11899.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 686004509 is about 26191.6877844861. The cubic root of 686004509 is about 881.9466672297.

The spelling of 686004509 in words is "six hundred eighty-six million, four thousand, five hundred nine".