686128674 has 48 divisors (see below), whose sum is σ = 1741425696. Its totient is φ = 178214400.

The previous prime is 686128657. The next prime is 686128697. The reversal of 686128674 is 476821686.

686128674 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102847 + ... + 109314.

It is an arithmetic number, because the mean of its divisors is an integer number (36279702).

Almost surely, 2^686128674 is an apocalyptic number.

686128674 is an abundant number, since it is smaller than the sum of its proper divisors (1055297022).

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

686128674 is a wasteful number, since it uses less digits than its factorization.

686128674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212191 (or 212184 counting only the distinct ones).

The product of its digits is 774144, while the sum is 48.

The square root of 686128674 is about 26194.0579903153. The cubic root of 686128674 is about 881.9998740237. Note that the first 3 decimals are identical.

The spelling of 686128674 in words is "six hundred eighty-six million, one hundred twenty-eight thousand, six hundred seventy-four".