678637012 has 6 divisors (see below), whose sum is σ = 1187614778. Its totient is φ = 339318504.

The previous prime is 678637007. The next prime is 678637013. The reversal of 678637012 is 210736876.

678637012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 663783696 + 14853316 = 25764^2 + 3854^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678637013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84829623 + ... + 84829630.

Almost surely, 2^678637012 is an apocalyptic number.

It is an amenable number.

678637012 is a deficient number, since it is larger than the sum of its proper divisors (508977766).

678637012 is a wasteful number, since it uses less digits than its factorization.

678637012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169659257 (or 169659255 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 678637012 is about 26050.6624100041. The cubic root of 678637012 is about 878.7780094766.

The spelling of 678637012 in words is "six hundred seventy-eight million, six hundred thirty-seven thousand, twelve".