686247816 has 32 divisors (see below), whose sum is σ = 1747992960. Its totient is φ = 224432832.

The previous prime is 686247811. The next prime is 686247839. The reversal of 686247816 is 618742686.

686247816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (686247811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268480 + ... + 271023.

It is an arithmetic number, because the mean of its divisors is an integer number (54624780).

Almost surely, 2^686247816 is an apocalyptic number.

It is an amenable number.

686247816 is an abundant number, since it is smaller than the sum of its proper divisors (1061745144).

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

686247816 is a wasteful number, since it uses less digits than its factorization.

686247816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539565 (or 539561 counting only the distinct ones).

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

The square root of 686247816 is about 26196.3321096676. The cubic root of 686247816 is about 882.0509223431.

The spelling of 686247816 in words is "six hundred eighty-six million, two hundred forty-seven thousand, eight hundred sixteen".