678545864 has 32 divisors (see below), whose sum is σ = 1293278400. Its totient is φ = 333695040.

The previous prime is 678545821. The next prime is 678545867. The reversal of 678545864 is 468545876.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (678545867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287939 + ... + 290285.

It is an arithmetic number, because the mean of its divisors is an integer number (40414950).

Almost surely, 2^678545864 is an apocalyptic number.

It is an amenable number.

678545864 is a deficient number, since it is larger than the sum of its proper divisors (614732536).

678545864 is a wasteful number, since it uses less digits than its factorization.

678545864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2933 (or 2929 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 53.

The square root of 678545864 is about 26048.9129139778. The cubic root of 678545864 is about 878.7386647101.

The spelling of 678545864 in words is "six hundred seventy-eight million, five hundred forty-five thousand, eight hundred sixty-four".