678647028 has 24 divisors (see below), whose sum is σ = 1610350560. Its totient is φ = 222381280.

The previous prime is 678647003. The next prime is 678647063. The reversal of 678647028 is 820746876.

678647028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×678647028² = 921123577226465568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478563 + ... + 479978.

It is an arithmetic number, because the mean of its divisors is an integer number (67097940).

Almost surely, 2^678647028 is an apocalyptic number.

It is an amenable number.

678647028 is an abundant number, since it is smaller than the sum of its proper divisors (931703532).

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

678647028 is a wasteful number, since it uses less digits than its factorization.

678647028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958607 (or 958605 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 48.

The square root of 678647028 is about 26050.8546500878. The cubic root of 678647028 is about 878.7823327487.

The spelling of 678647028 in words is "six hundred seventy-eight million, six hundred forty-seven thousand, twenty-eight".