686843868 has 24 divisors (see below), whose sum is σ = 1603059472. Its totient is φ = 228887424.

The previous prime is 686843851. The next prime is 686843869. The reversal of 686843868 is 868348686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686843869) 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, 85146 + ... + 92862.

Almost surely, 2^686843868 is an apocalyptic number.

It is an amenable number.

686843868 is an abundant number, since it is smaller than the sum of its proper divisors (916215604).

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

686843868 is a wasteful number, since it uses less digits than its factorization.

686843868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15141 (or 15139 counting only the distinct ones).

The product of its digits is 10616832, while the sum is 57.

The square root of 686843868 is about 26207.7062712478. The cubic root of 686843868 is about 882.3062217951.

The spelling of 686843868 in words is "six hundred eighty-six million, eight hundred forty-three thousand, eight hundred sixty-eight".