686036378 has 16 divisors (see below), whose sum is σ = 1046871240. Its totient is φ = 337089600.

The previous prime is 686036371. The next prime is 686036437. The reversal of 686036378 is 873630686.

It can be written as a sum of positive squares in 4 ways, for example, as 290941249 + 395095129 = 17057^2 + 19877^2 .

It is not an unprimeable number, because it can be changed into a prime (686036371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196028 + ... + 199496.

Almost surely, 2^686036378 is an apocalyptic number.

686036378 is a deficient number, since it is larger than the sum of its proper divisors (360834862).

686036378 is a wasteful number, since it uses less digits than its factorization.

686036378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5153.

The product of its (nonzero) digits is 870912, while the sum is 47.

The square root of 686036378 is about 26192.2961574582. The cubic root of 686036378 is about 881.9603242454.

The spelling of 686036378 in words is "six hundred eighty-six million, thirty-six thousand, three hundred seventy-eight".