678911668 has 12 divisors (see below), whose sum is σ = 1220206372. Its totient is φ = 330281280.

The previous prime is 678911659. The next prime is 678911689. The reversal of 678911668 is 866119876.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 593312164 + 85599504 = 24358^2 + 9252^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2293473 + ... + 2293768.

Almost surely, 2^678911668 is an apocalyptic number.

It is an amenable number.

678911668 is a deficient number, since it is larger than the sum of its proper divisors (541294704).

678911668 is a wasteful number, since it uses less digits than its factorization.

678911668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4587282 (or 4587280 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The square root of 678911668 is about 26055.9334509436. The cubic root of 678911668 is about 878.8965456479.

The spelling of 678911668 in words is "six hundred seventy-eight million, nine hundred eleven thousand, six hundred sixty-eight".