686000000 has 224 divisors, whose sum is σ = 1992162000. Its totient is φ = 235200000.

The previous prime is 685999999. The next prime is 686000009. The reversal of 686000000 is 686.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a zygodrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686000009) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 97999997 + ... + 98000003.

Almost surely, 2^686000000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (996081000).

686000000 is an abundant number, since it is smaller than the sum of its proper divisors (1306162000).

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

686000000 is an frugal number, since it uses more digits than its factorization.

686000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65 (or 14 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 686000000 is about 26191.6017074176. The cubic root of 686000000 is about 881.9447349264.

Adding to 686000000 its reverse (686), we get a palindrome (686000686).

Multiplying 686000000 by its reverse (686), we get a square (470596000000 = 686000²).

686000000 divided by its reverse (686) gives a 6-th power (1000000 = 10⁶).

The spelling of 686000000 in words is "six hundred eighty-six million", and thus it is an aban number.