686948578 has 8 divisors (see below), whose sum is σ = 1065954780. Its totient is φ = 331630320.

The previous prime is 686948543. The next prime is 686948593. The reversal of 686948578 is 875849686.

It can be written as a sum of positive squares in 2 ways, for example, as 661878529 + 25070049 = 25727^2 + 5007^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5921913 + ... + 5922028.

Almost surely, 2^686948578 is an apocalyptic number.

686948578 is a deficient number, since it is larger than the sum of its proper divisors (379006202).

686948578 is a wasteful number, since it uses less digits than its factorization.

686948578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11843972.

The product of its digits is 23224320, while the sum is 61.

The square root of 686948578 is about 26209.7038899717. The cubic root of 686948578 is about 882.3510556573.

The spelling of 686948578 in words is "six hundred eighty-six million, nine hundred forty-eight thousand, five hundred seventy-eight".