678669442 has 16 divisors (see below), whose sum is σ = 1112463072. Its totient is φ = 307954720.

The previous prime is 678669403. The next prime is 678669451. The reversal of 678669442 is 244966876.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 678669442.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 13363 + ... + 39190.

It is an arithmetic number, because the mean of its divisors is an integer number (69528942).

Almost surely, 2^678669442 is an apocalyptic number.

678669442 is a deficient number, since it is larger than the sum of its proper divisors (433793630).

678669442 is a wasteful number, since it uses less digits than its factorization.

678669442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53153.

The product of its digits is 3483648, while the sum is 52.

The square root of 678669442 is about 26051.2848435543. The cubic root of 678669442 is about 878.7920072970.

The spelling of 678669442 in words is "six hundred seventy-eight million, six hundred sixty-nine thousand, four hundred forty-two".