686748726846 has 144 divisors (see below), whose sum is σ = 1938308711040. Its totient is φ = 171587782080.

The previous prime is 686748726821. The next prime is 686748726857. The reversal of 686748726846 is 648627847686.

686748726846 is a `hidden beast` number, since 6 + 8 + 67 + 487 + 2 + 6 + 84 + 6 = 666.

It is a super-2 number, since 2×686748726846² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 444120 + ... + 1253291.

It is an arithmetic number, because the mean of its divisors is an integer number (13460477160).

Almost surely, 2^686748726846 is an apocalyptic number.

686748726846 is an abundant number, since it is smaller than the sum of its proper divisors (1251559984194).

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

686748726846 is a wasteful number, since it uses less digits than its factorization.

686748726846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697471 (or 1697455 counting only the distinct ones).

The product of its digits is 1040449536, while the sum is 72.

The spelling of 686748726846 in words is "six hundred eighty-six billion, seven hundred forty-eight million, seven hundred twenty-six thousand, eight hundred forty-six".