686148068 has 6 divisors (see below), whose sum is σ = 1200759126. Its totient is φ = 343074032.

The previous prime is 686148061. The next prime is 686148173. The reversal of 686148068 is 860841686.

686148068 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 499880164 + 186267904 = 22358^2 + 13648^2 .

It is not an unprimeable number, because it can be changed into a prime (686148061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85768505 + ... + 85768512.

It is an arithmetic number, because the mean of its divisors is an integer number (200126521).

Almost surely, 2^686148068 is an apocalyptic number.

It is an amenable number.

686148068 is a deficient number, since it is larger than the sum of its proper divisors (514611058).

686148068 is a wasteful number, since it uses less digits than its factorization.

686148068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171537021 (or 171537019 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 47.

The square root of 686148068 is about 26194.4281861620. The cubic root of 686148068 is about 882.0081840997.

The spelling of 686148068 in words is "six hundred eighty-six million, one hundred forty-eight thousand, sixty-eight".