686857408 has 28 divisors (see below), whose sum is σ = 1382188752. Its totient is φ = 338589440.

The previous prime is 686857403. The next prime is 686857417. The reversal of 686857408 is 804758686.

It is not an unprimeable number, because it can be changed into a prime (686857403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71035 + ... + 80122.

It is an arithmetic number, because the mean of its divisors is an integer number (49363884).

Almost surely, 2^686857408 is an apocalyptic number.

It is an amenable number.

686857408 is an abundant number, since it is smaller than the sum of its proper divisors (695331344).

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

686857408 is a wasteful number, since it uses less digits than its factorization.

686857408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151240 (or 151230 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 52.

The square root of 686857408 is about 26207.9645909407. The cubic root of 686857408 is about 882.3120194969.

The spelling of 686857408 in words is "six hundred eighty-six million, eight hundred fifty-seven thousand, four hundred eight".