686628218 has 16 divisors (see below), whose sum is σ = 1047520320. Its totient is φ = 337486176.

The previous prime is 686628211. The next prime is 686628259. The reversal of 686628218 is 812826686.

It is not an unprimeable number, because it can be changed into a prime (686628211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37163 + ... + 52481.

It is an arithmetic number, because the mean of its divisors is an integer number (65470020).

Almost surely, 2^686628218 is an apocalyptic number.

686628218 is a deficient number, since it is larger than the sum of its proper divisors (360892102).

686628218 is a wasteful number, since it uses less digits than its factorization.

686628218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15701.

The product of its digits is 442368, while the sum is 47.

The square root of 686628218 is about 26203.5917003757. The cubic root of 686628218 is about 882.2138722029.

The spelling of 686628218 in words is "six hundred eighty-six million, six hundred twenty-eight thousand, two hundred eighteen".