678630717 has 24 divisors (see below), whose sum is σ = 1019689216. Its totient is φ = 451023552.

The previous prime is 678630643. The next prime is 678630731. The reversal of 678630717 is 717036876.

It is a happy number.

678630717 is a `hidden beast` number, since 6 + 7 + 8 + 630 + 7 + 1 + 7 = 666.

678630717 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 678630717 - 2¹⁵ = 678597949 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 (678630217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77748 + ... + 86034.

Almost surely, 2^678630717 is an apocalyptic number.

It is an amenable number.

678630717 is a deficient number, since it is larger than the sum of its proper divisors (341058499).

678630717 is an equidigital number, since it uses as much as digits as its factorization.

678630717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8639 (or 8627 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 45.

The square root of 678630717 is about 26050.5415874603. The cubic root of 678630717 is about 878.7752923026.

The spelling of 678630717 in words is "six hundred seventy-eight million, six hundred thirty thousand, seven hundred seventeen".