686470857 has 16 divisors (see below), whose sum is σ = 959109120. Its totient is φ = 435907472.

The previous prime is 686470793. The next prime is 686470867. The reversal of 686470857 is 758074686.

It is a cyclic number.

It is not a de Polignac number, because 686470857 - 2⁶ = 686470793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (686470867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4323 + ... + 37304.

It is an arithmetic number, because the mean of its divisors is an integer number (59944320).

Almost surely, 2^686470857 is an apocalyptic number.

It is an amenable number.

686470857 is a deficient number, since it is larger than the sum of its proper divisors (272638263).

686470857 is a wasteful number, since it uses less digits than its factorization.

686470857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41892.

The product of its (nonzero) digits is 2257920, while the sum is 51.

The square root of 686470857 is about 26200.5888674282. The cubic root of 686470857 is about 882.1464719902.

The spelling of 686470857 in words is "six hundred eighty-six million, four hundred seventy thousand, eight hundred fifty-seven".