686843676 has 18 divisors (see below), whose sum is σ = 1736188272. Its totient is φ = 228947880.

The previous prime is 686843671. The next prime is 686843683. The reversal of 686843676 is 676348686.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×686843676² = 943508470522385952, which contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686843671) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9539460 + ... + 9539531.

It is an arithmetic number, because the mean of its divisors is an integer number (96454904).

Almost surely, 2^686843676 is an apocalyptic number.

It is an amenable number.

686843676 is an abundant number, since it is smaller than the sum of its proper divisors (1049344596).

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

686843676 is a wasteful number, since it uses less digits than its factorization.

686843676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19079001 (or 19078996 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 54.

The square root of 686843676 is about 26207.7026082028. The cubic root of 686843676 is about 882.3061395819.

The spelling of 686843676 in words is "six hundred eighty-six million, eight hundred forty-three thousand, six hundred seventy-six".