678581728 has 24 divisors (see below), whose sum is σ = 1457409240. Its totient is φ = 308446080.

The previous prime is 678581711. The next prime is 678581747. The reversal of 678581728 is 827185876.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 963543 + ... + 964246.

It is an arithmetic number, because the mean of its divisors is an integer number (60725385).

Almost surely, 2^678581728 is an apocalyptic number.

It is an amenable number.

678581728 is an abundant number, since it is smaller than the sum of its proper divisors (778827512).

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

678581728 is a wasteful number, since it uses less digits than its factorization.

678581728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1927810 (or 1927802 counting only the distinct ones).

The product of its digits is 1505280, while the sum is 52.

The square root of 678581728 is about 26049.6013021313. The cubic root of 678581728 is about 878.7541461143.

The spelling of 678581728 in words is "six hundred seventy-eight million, five hundred eighty-one thousand, seven hundred twenty-eight".