678691879 has 8 divisors (see below), whose sum is σ = 687155040. Its totient is φ = 670269600.

The previous prime is 678691873. The next prime is 678691921. The reversal of 678691879 is 978196876.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 678691879 - 2⁵ = 678691847 is a prime.

It is a super-3 number, since 3×678691879³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678691873) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 23889 + ... + 43909.

It is an arithmetic number, because the mean of its divisors is an integer number (85894380).

Almost surely, 2^678691879 is an apocalyptic number.

678691879 is a deficient number, since it is larger than the sum of its proper divisors (8463161).

678691879 is a wasteful number, since it uses less digits than its factorization.

678691879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20441.

The product of its digits is 9144576, while the sum is 61.

The square root of 678691879 is about 26051.7154713466. The cubic root of 678691879 is about 878.8016915594.

It can be divided in two parts, 6 and 78691879, that multiplied together give a palindrome (472151274).

The spelling of 678691879 in words is "six hundred seventy-eight million, six hundred ninety-one thousand, eight hundred seventy-nine".