678923856 has 200 divisors, whose sum is σ = 2155174560. Its totient is φ = 205058304.

The previous prime is 678923837. The next prime is 678923887. The reversal of 678923856 is 658329876.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 993691 + ... + 994373.

Almost surely, 2^678923856 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 678923856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1077587280).

678923856 is an abundant number, since it is smaller than the sum of its proper divisors (1476250704).

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

678923856 is a wasteful number, since it uses less digits than its factorization.

678923856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775 (or 760 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 678923856 is about 26056.1673313632. The cubic root of 678923856 is about 878.9018050101.

The spelling of 678923856 in words is "six hundred seventy-eight million, nine hundred twenty-three thousand, eight hundred fifty-six".