678969878 has 8 divisors (see below), whose sum is σ = 1019085672. Its totient is φ = 339274656.

The previous prime is 678969859. The next prime is 678969901. The reversal of 678969878 is 878969876.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×678969878² = 922000190462669768, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101075 + ... + 107582.

It is an arithmetic number, because the mean of its divisors is an integer number (127385709).

Almost surely, 2^678969878 is an apocalyptic number.

678969878 is a deficient number, since it is larger than the sum of its proper divisors (340115794).

678969878 is a wasteful number, since it uses less digits than its factorization.

678969878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210286.

The product of its digits is 73156608, while the sum is 68.

The square root of 678969878 is about 26057.0504470479. The cubic root of 678969878 is about 878.9216638423.

It can be divided in two parts, 6789 and 69878, that added together give a palindrome (76667).

The spelling of 678969878 in words is "six hundred seventy-eight million, nine hundred sixty-nine thousand, eight hundred seventy-eight".