686864858 has 8 divisors (see below), whose sum is σ = 1084523520. Its totient is φ = 325357020.

The previous prime is 686864837. The next prime is 686864881. The reversal of 686864858 is 858468686.

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

It is a junction number, because it is equal to n+sod(n) for n = 686864797 and 686864806.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9037658 + ... + 9037733.

It is an arithmetic number, because the mean of its divisors is an integer number (135565440).

Almost surely, 2^686864858 is an apocalyptic number.

686864858 is a deficient number, since it is larger than the sum of its proper divisors (397658662).

686864858 is a wasteful number, since it uses less digits than its factorization.

686864858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18075412.

The product of its digits is 17694720, while the sum is 59.

The square root of 686864858 is about 26208.1067229207. The cubic root of 686864858 is about 882.3152094849.

The spelling of 686864858 in words is "six hundred eighty-six million, eight hundred sixty-four thousand, eight hundred fifty-eight".