678868647 has 8 divisors (see below), whose sum is σ = 906082944. Its totient is φ = 452116728.

The previous prime is 678868643. The next prime is 678868717. The reversal of 678868647 is 746868876.

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

It is not a de Polignac number, because 678868647 - 2² = 678868643 is a prime.

It is a super-2 number, since 2×678868647² = 921725279759221218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678868643) by changing a digit.

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, 112153 + ... + 118050.

It is an arithmetic number, because the mean of its divisors is an integer number (113260368).

Almost surely, 2^678868647 is an apocalyptic number.

678868647 is a deficient number, since it is larger than the sum of its proper divisors (227214297).

678868647 is a wasteful number, since it uses less digits than its factorization.

678868647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231189.

The product of its digits is 21676032, while the sum is 60.

The square root of 678868647 is about 26055.1078869384. The cubic root of 678868647 is about 878.8779807355.

The spelling of 678868647 in words is "six hundred seventy-eight million, eight hundred sixty-eight thousand, six hundred forty-seven".