678121876 has 6 divisors (see below), whose sum is σ = 1186713290. Its totient is φ = 339060936.

The previous prime is 678121849. The next prime is 678121879.

678121876 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 440160400 + 237961476 = 20980^2 + 15426^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678121879) 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 as a sum of consecutive naturals, namely, 84765231 + ... + 84765238.

Almost surely, 2^678121876 is an apocalyptic number.

It is an amenable number.

678121876 is a deficient number, since it is larger than the sum of its proper divisors (508591414).

678121876 is a wasteful number, since it uses less digits than its factorization.

678121876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169530473 (or 169530471 counting only the distinct ones).

The product of its digits is 225792, while the sum is 46.

The square root of 678121876 is about 26040.7733372110. The cubic root of 678121876 is about 878.5556005546. Note that the first 3 decimals are identical.

The spelling of 678121876 in words is "six hundred seventy-eight million, one hundred twenty-one thousand, eight hundred seventy-six".