686845854 has 48 divisors (see below), whose sum is σ = 1507980240. Its totient is φ = 225916800.

The previous prime is 686845847. The next prime is 686845871. The reversal of 686845854 is 458548686.

It is a self number, because there is not a number n which added to its sum of digits gives 686845854.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 848602 + ... + 849410.

It is an arithmetic number, because the mean of its divisors is an integer number (31416255).

Almost surely, 2^686845854 is an apocalyptic number.

686845854 is an abundant number, since it is smaller than the sum of its proper divisors (821134386).

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

686845854 is a wasteful number, since it uses less digits than its factorization.

686845854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385 (or 1382 counting only the distinct ones).

The product of its digits is 7372800, while the sum is 54.

The square root of 686845854 is about 26207.7441608392. The cubic root of 686845854 is about 882.3070721865.

The spelling of 686845854 in words is "six hundred eighty-six million, eight hundred forty-five thousand, eight hundred fifty-four".