686974964 has 48 divisors (see below), whose sum is σ = 1376096400. Its totient is φ = 298303488.

The previous prime is 686974961. The next prime is 686974969. The reversal of 686974964 is 469479686.

It can be written as a sum of positive squares in 8 ways, for example, as 125664100 + 561310864 = 11210^2 + 23692^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686974961) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 254132 + ... + 256820.

It is an arithmetic number, because the mean of its divisors is an integer number (28668675).

Almost surely, 2^686974964 is an apocalyptic number.

It is an amenable number.

686974964 is an abundant number, since it is smaller than the sum of its proper divisors (689121436).

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

686974964 is a wasteful number, since it uses less digits than its factorization.

686974964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2757 (or 2721 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 59.

The square root of 686974964 is about 26210.2072483222. The cubic root of 686974964 is about 882.3623526780.

The spelling of 686974964 in words is "six hundred eighty-six million, nine hundred seventy-four thousand, nine hundred sixty-four".