686857433438 has 8 divisors (see below), whose sum is σ = 1123948527480. Its totient is φ = 312207924280.

The previous prime is 686857433411. The next prime is 686857433441. The reversal of 686857433438 is 834334758686.

It is a happy number.

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

It is a congruent number.

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, 15610396193 + ... + 15610396236.

It is an arithmetic number, because the mean of its divisors is an integer number (140493565935).

Almost surely, 2^686857433438 is an apocalyptic number.

686857433438 is a deficient number, since it is larger than the sum of its proper divisors (437091094042).

686857433438 is a wasteful number, since it uses less digits than its factorization.

686857433438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31220792442.

The product of its digits is 278691840, while the sum is 65.

The spelling of 686857433438 in words is "six hundred eighty-six billion, eight hundred fifty-seven million, four hundred thirty-three thousand, four hundred thirty-eight".