678860680 has 16 divisors (see below), whose sum is σ = 1527436620. Its totient is φ = 271544256.

The previous prime is 678860669. The next prime is 678860713. The reversal of 678860680 is 86068876.

It can be written as a sum of positive squares in 2 ways, for example, as 649332324 + 29528356 = 25482^2 + 5434^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8485719 + ... + 8485798.

Almost surely, 2^678860680 is an apocalyptic number.

It is an amenable number.

678860680 is an abundant number, since it is smaller than the sum of its proper divisors (848575940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678860680 is a wasteful number, since it uses less digits than its factorization.

678860680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16971528 (or 16971524 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The square root of 678860680 is about 26054.9549990016. The cubic root of 678860680 is about 878.8745426387.

The spelling of 678860680 in words is "six hundred seventy-eight million, eight hundred sixty thousand, six hundred eighty".