686778862 has 16 divisors (see below), whose sum is σ = 1284365952. Its totient is φ = 267576120.

The previous prime is 686778853. The next prime is 686778863. The reversal of 686778862 is 268877686.

It is a junction number, because it is equal to n+sod(n) for n = 686778797 and 686778806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686778863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2229648 + ... + 2229955.

It is an arithmetic number, because the mean of its divisors is an integer number (80272872).

Almost surely, 2^686778862 is an apocalyptic number.

686778862 is a deficient number, since it is larger than the sum of its proper divisors (597587090).

686778862 is a wasteful number, since it uses less digits than its factorization.

686778862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4459623.

The product of its digits is 10838016, while the sum is 58.

The square root of 686778862 is about 26206.4660341680. The cubic root of 686778862 is about 882.2783857708.

The spelling of 686778862 in words is "six hundred eighty-six million, seven hundred seventy-eight thousand, eight hundred sixty-two".