678131817 has 16 divisors (see below), whose sum is σ = 987310272. Its totient is φ = 410598720.

The previous prime is 678131771. The next prime is 678131843. The reversal of 678131817 is 718131876.

678131817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 678131817 - 2⁷ = 678131689 is a prime.

It is a super-2 number, since 2×678131817² = 919725522455442978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (678131897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27663 + ... + 46059.

It is an arithmetic number, because the mean of its divisors is an integer number (61706892).

Almost surely, 2^678131817 is an apocalyptic number.

It is an amenable number.

678131817 is a deficient number, since it is larger than the sum of its proper divisors (309178455).

678131817 is a wasteful number, since it uses less digits than its factorization.

678131817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19528.

The product of its digits is 56448, while the sum is 42.

The square root of 678131817 is about 26040.9642102592. The cubic root of 678131817 is about 878.5598936268.

The spelling of 678131817 in words is "six hundred seventy-eight million, one hundred thirty-one thousand, eight hundred seventeen".