678936385 has 8 divisors (see below), whose sum is σ = 832058496. Its totient is φ = 531592560.

The previous prime is 678936359. The next prime is 678936397. The reversal of 678936385 is 583639876.

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

It is a de Polignac number, because none of the positive numbers 2^k-678936385 is a prime.

It is a super-2 number, since 2×678936385² = 921909229753736450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1444311 + ... + 1444780.

It is an arithmetic number, because the mean of its divisors is an integer number (104007312).

Almost surely, 2^678936385 is an apocalyptic number.

It is an amenable number.

678936385 is a deficient number, since it is larger than the sum of its proper divisors (153122111).

678936385 is a wasteful number, since it uses less digits than its factorization.

678936385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2889143.

The product of its digits is 6531840, while the sum is 55.

The square root of 678936385 is about 26056.4077531804. The cubic root of 678936385 is about 878.9072114548.

The spelling of 678936385 in words is "six hundred seventy-eight million, nine hundred thirty-six thousand, three hundred eighty-five".