686407698 has 12 divisors (see below), whose sum is σ = 1487216718. Its totient is φ = 228802560.

The previous prime is 686407681. The next prime is 686407703. The reversal of 686407698 is 896704686.

It can be written as a sum of positive squares in only one way, i.e., 349428249 + 336979449 = 18693^2 + 18357^2 .

It is a Curzon number.

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 5 ways as a sum of consecutive naturals, for example, 19066863 + ... + 19066898.

Almost surely, 2^686407698 is an apocalyptic number.

686407698 is an abundant number, since it is smaller than the sum of its proper divisors (800809020).

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

686407698 is a wasteful number, since it uses less digits than its factorization.

686407698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38133769 (or 38133766 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The square root of 686407698 is about 26199.3835423660. The cubic root of 686407698 is about 882.1194170918.

The spelling of 686407698 in words is "six hundred eighty-six million, four hundred seven thousand, six hundred ninety-eight".