678442530 has 64 divisors (see below), whose sum is σ = 1695479040. Its totient is φ = 173531904.

The previous prime is 678442529. The next prime is 678442561. The reversal of 678442530 is 35244876.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134107 + ... + 139073.

It is an arithmetic number, because the mean of its divisors is an integer number (26491860).

Almost surely, 2^678442530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678442530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (847739520).

678442530 is an abundant number, since it is smaller than the sum of its proper divisors (1017036510).

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

678442530 is a wasteful number, since it uses less digits than its factorization.

678442530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5163.

The product of its (nonzero) digits is 161280, while the sum is 39.

The square root of 678442530 is about 26046.9293775677. The cubic root of 678442530 is about 878.6940554971.

The spelling of 678442530 in words is "six hundred seventy-eight million, four hundred forty-two thousand, five hundred thirty".