678415679 has 4 divisors (see below), whose sum is σ = 678471384. Its totient is φ = 678359976.

The previous prime is 678415657. The next prime is 678415697. The reversal of 678415679 is 976514876.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678415679 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 678415679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678415649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 872 + ... + 36845.

It is an arithmetic number, because the mean of its divisors is an integer number (169617846).

Almost surely, 2^678415679 is an apocalyptic number.

678415679 is a deficient number, since it is larger than the sum of its proper divisors (55705).

678415679 is a wasteful number, since it uses less digits than its factorization.

678415679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55704.

The product of its digits is 2540160, while the sum is 53.

The square root of 678415679 is about 26046.4139374310. The cubic root of 678415679 is about 878.6824631984.

It can be divided in two parts, 6 and 78415679, that multiplied together give a palindrome (470494074).

The spelling of 678415679 in words is "six hundred seventy-eight million, four hundred fifteen thousand, six hundred seventy-nine".