678223728 has 240 divisors, whose sum is σ = 2371445440. Its totient is φ = 176173056.

The previous prime is 678223723. The next prime is 678223729. The reversal of 678223728 is 827322876.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678223723) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 956238 + ... + 956946.

Almost surely, 2^678223728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678223728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1185722720).

678223728 is an abundant number, since it is smaller than the sum of its proper divisors (1693221712).

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

678223728 is a wasteful number, since it uses less digits than its factorization.

678223728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816 (or 807 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 678223728 is about 26042.7288892696. The cubic root of 678223728 is about 878.5995838800.

The spelling of 678223728 in words is "six hundred seventy-eight million, two hundred twenty-three thousand, seven hundred twenty-eight".