686715378 has 8 divisors (see below), whose sum is σ = 1373430768. Its totient is φ = 228905124.

The previous prime is 686715313. The next prime is 686715397. The reversal of 686715378 is 873517686.

It is a sphenic number, since it is the product of 3 distinct primes.

686715378 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 686715378.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57226276 + ... + 57226287.

It is an arithmetic number, because the mean of its divisors is an integer number (171678846).

Almost surely, 2^686715378 is an apocalyptic number.

686715378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

686715378 is a wasteful number, since it uses less digits than its factorization.

686715378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114452568.

The product of its digits is 1693440, while the sum is 51.

The square root of 686715378 is about 26205.2547783837. The cubic root of 686715378 is about 882.2511997822.

The spelling of 686715378 in words is "six hundred eighty-six million, seven hundred fifteen thousand, three hundred seventy-eight".