684307318 has 4 divisors (see below), whose sum is σ = 1026460980. Its totient is φ = 342153658.

The previous prime is 684307303. The next prime is 684307331. The reversal of 684307318 is 813703486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 813703486 = 2 ⋅406851743.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 171076828 + ... + 171076831.

It is an arithmetic number, because the mean of its divisors is an integer number (256615245).

Almost surely, 2^684307318 is an apocalyptic number.

684307318 is a deficient number, since it is larger than the sum of its proper divisors (342153662).

684307318 is a wasteful number, since it uses less digits than its factorization.

684307318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342153661.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 684307318 is about 26159.2683001647. The cubic root of 684307318 is about 881.2187477943.

The spelling of 684307318 in words is "six hundred eighty-four million, three hundred seven thousand, three hundred eighteen".