678171664 has 20 divisors (see below), whose sum is σ = 1319604156. Its totient is φ = 337628672.

The previous prime is 678171661. The next prime is 678171707. The reversal of 678171664 is 466171876.

It can be written as a sum of positive squares in 2 ways, for example, as 102171664 + 576000000 = 10108^2 + 24000^2 .

It is not an unprimeable number, because it can be changed into a prime (678171661) 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, 87229 + ... + 94684.

Almost surely, 2^678171664 is an apocalyptic number.

It is an amenable number.

678171664 is a deficient number, since it is larger than the sum of its proper divisors (641432492).

678171664 is a wasteful number, since it uses less digits than its factorization.

678171664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182154 (or 182148 counting only the distinct ones).

The product of its digits is 338688, while the sum is 46.

The square root of 678171664 is about 26041.7292820581. The cubic root of 678171664 is about 878.5771013385.

The spelling of 678171664 in words is "six hundred seventy-eight million, one hundred seventy-one thousand, six hundred sixty-four".