686682478 has 4 divisors (see below), whose sum is σ = 1030023720. Its totient is φ = 343341238.

The previous prime is 686682331. The next prime is 686682509. The reversal of 686682478 is 874286686.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×686682478³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171670618 + ... + 171670621.

It is an arithmetic number, because the mean of its divisors is an integer number (257505930).

Almost surely, 2^686682478 is an apocalyptic number.

686682478 is a deficient number, since it is larger than the sum of its proper divisors (343341242).

686682478 is a wasteful number, since it uses less digits than its factorization.

686682478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343341241.

The product of its digits is 6193152, while the sum is 55.

The square root of 686682478 is about 26204.6270341709. The cubic root of 686682478 is about 882.2371102341.

The spelling of 686682478 in words is "six hundred eighty-six million, six hundred eighty-two thousand, four hundred seventy-eight".