678217056872 has 16 divisors (see below), whose sum is σ = 1280191594500. Its totient is φ = 336832631680.

The previous prime is 678217056863. The next prime is 678217056877. The reversal of 678217056872 is 278650712876.

It can be written as a sum of positive squares in 2 ways, for example, as 677384965156 + 832091716 = 823034^2 + 28846^2 .

It is not an unprimeable number, because it can be changed into a prime (678217056877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284485829 + ... + 284488212.

Almost surely, 2^678217056872 is an apocalyptic number.

It is an amenable number.

678217056872 is a deficient number, since it is larger than the sum of its proper divisors (601974537628).

678217056872 is a wasteful number, since it uses less digits than its factorization.

678217056872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568974196 (or 568974192 counting only the distinct ones).

The product of its (nonzero) digits is 15805440, while the sum is 59.

The spelling of 678217056872 in words is "six hundred seventy-eight billion, two hundred seventeen million, fifty-six thousand, eight hundred seventy-two".