678877679 has 4 divisors (see below), whose sum is σ = 694665576. Its totient is φ = 663089784.

The previous prime is 678877669. The next prime is 678877681. The reversal of 678877679 is 976778876.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678877679 - 2¹² = 678873583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678877669) 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, 7893884 + ... + 7893969.

It is an arithmetic number, because the mean of its divisors is an integer number (173666394).

Almost surely, 2^678877679 is an apocalyptic number.

678877679 is a deficient number, since it is larger than the sum of its proper divisors (15787897).

678877679 is a wasteful number, since it uses less digits than its factorization.

678877679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15787896.

The product of its digits is 49787136, while the sum is 65.

The square root of 678877679 is about 26055.2812113015. The cubic root of 678877679 is about 878.8818783921.

The spelling of 678877679 in words is "six hundred seventy-eight million, eight hundred seventy-seven thousand, six hundred seventy-nine".