678680730 has 192 divisors, whose sum is σ = 2188892160. Its totient is φ = 142069248.

The previous prime is 678680701. The next prime is 678680731. The reversal of 678680730 is 37086876.

678680730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (678680731) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1416631 + ... + 1417109.

It is an arithmetic number, because the mean of its divisors is an integer number (11400480).

Almost surely, 2^678680730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678680730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1094446080).

678680730 is an abundant number, since it is smaller than the sum of its proper divisors (1510211430).

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

678680730 is a wasteful number, since it uses less digits than its factorization.

678680730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685 (or 682 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 678680730 is about 26051.5014922365. The cubic root of 678680730 is about 878.7968794525.

The spelling of 678680730 in words is "six hundred seventy-eight million, six hundred eighty thousand, seven hundred thirty".