678869128 has 48 divisors (see below), whose sum is σ = 1512241920. Its totient is φ = 284745888.

The previous prime is 678869123. The next prime is 678869141. The reversal of 678869128 is 821968876.

678869128 is a nontrivial binomial coefficient, being equal to C(36848, 2).

It is not an unprimeable number, because it can be changed into a prime (678869123) 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 11 ways as a sum of consecutive naturals, for example, 1 + ... + 36847.

It is an arithmetic number, because the mean of its divisors is an integer number (31505040).

Almost surely, 2^678869128 is an apocalyptic number.

678869128 is the 36847-th triangular number and also the 18424-th hexagonal number.

678869128 is the 12283-rd centered nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678869128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (756120960).

678869128 is an abundant number, since it is smaller than the sum of its proper divisors (833372792).

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

678869128 is a wasteful number, since it uses less digits than its factorization.

678869128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36914 (or 36903 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 55.

The square root of 678869128 is about 26055.1171173725. The cubic root of 678869128 is about 878.8781883064.

The spelling of 678869128 in words is "six hundred seventy-eight million, eight hundred sixty-nine thousand, one hundred twenty-eight".