678868646 has 16 divisors (see below), whose sum is σ = 1032575040. Its totient is φ = 334688640.

The previous prime is 678868643. The next prime is 678868717. The reversal of 678868646 is 646868876.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136760 + ... + 141636.

It is an arithmetic number, because the mean of its divisors is an integer number (64535940).

Almost surely, 2^678868646 is an apocalyptic number.

678868646 is a deficient number, since it is larger than the sum of its proper divisors (353706394).

678868646 is a wasteful number, since it uses less digits than its factorization.

678868646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5839.

The product of its digits is 18579456, while the sum is 59.

The square root of 678868646 is about 26055.1078677483. The cubic root of 678868646 is about 878.8779803039.

The spelling of 678868646 in words is "six hundred seventy-eight million, eight hundred sixty-eight thousand, six hundred forty-six".