678697728 has 36 divisors (see below), whose sum is σ = 1806327768. Its totient is φ = 226232320.

The previous prime is 678697711. The next prime is 678697751. The reversal of 678697728 is 827796876.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441093 + ... + 442628.

Almost surely, 2^678697728 is an apocalyptic number.

It is an amenable number.

678697728 is an abundant number, since it is smaller than the sum of its proper divisors (1127630040).

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

678697728 is an equidigital number, since it uses as much as digits as its factorization.

678697728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883740 (or 883726 counting only the distinct ones).

The product of its digits is 14224896, while the sum is 60.

The square root of 678697728 is about 26051.8277285875. The cubic root of 678697728 is about 878.8042160709.

The spelling of 678697728 in words is "six hundred seventy-eight million, six hundred ninety-seven thousand, seven hundred twenty-eight".