686857471 has 8 divisors (see below), whose sum is σ = 693328064. Its totient is φ = 680417280.

The previous prime is 686857463. The next prime is 686857481. The reversal of 686857471 is 174758686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 686857471 - 2³ = 686857463 is a prime.

It is a super-3 number, since 3×686857471³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686857481) 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, 39130 + ... + 53896.

It is an arithmetic number, because the mean of its divisors is an integer number (86666008).

Almost surely, 2^686857471 is an apocalyptic number.

686857471 is a deficient number, since it is larger than the sum of its proper divisors (6470593).

686857471 is a wasteful number, since it uses less digits than its factorization.

686857471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15201.

The product of its digits is 2257920, while the sum is 52.

The square root of 686857471 is about 26207.9657928653. The cubic root of 686857471 is about 882.3120464727.

The spelling of 686857471 in words is "six hundred eighty-six million, eight hundred fifty-seven thousand, four hundred seventy-one".