678648194 has 32 divisors (see below), whose sum is σ = 1296673920. Its totient is φ = 259331328.

The previous prime is 678648163. The next prime is 678648197. The reversal of 678648194 is 491846876.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (678648197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70517 + ... + 79560.

It is an arithmetic number, because the mean of its divisors is an integer number (40521060).

Almost surely, 2^678648194 is an apocalyptic number.

678648194 is a deficient number, since it is larger than the sum of its proper divisors (618025726).

678648194 is a wasteful number, since it uses less digits than its factorization.

678648194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150122.

The product of its digits is 2322432, while the sum is 53.

The square root of 678648194 is about 26050.8770293823. The cubic root of 678648194 is about 878.7828360342.

The spelling of 678648194 in words is "six hundred seventy-eight million, six hundred forty-eight thousand, one hundred ninety-four".