684731408 has 20 divisors (see below), whose sum is σ = 1342653648. Its totient is φ = 338240160.

The previous prime is 684731401. The next prime is 684731417. The reversal of 684731408 is 804137486.

It is a super-2 number, since 2×684731408² = 937714202203324928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (684731401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256478 + ... + 259133.

Almost surely, 2^684731408 is an apocalyptic number.

It is an amenable number.

684731408 is a deficient number, since it is larger than the sum of its proper divisors (657922240).

684731408 is a wasteful number, since it uses less digits than its factorization.

684731408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515702 (or 515696 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 684731408 is about 26167.3729671131. The cubic root of 684731408 is about 881.4007512469.

The spelling of 684731408 in words is "six hundred eighty-four million, seven hundred thirty-one thousand, four hundred eight".