678188664 has 96 divisors (see below), whose sum is σ = 1907334000. Its totient is φ = 217437696.

The previous prime is 678188659. The next prime is 678188671. The reversal of 678188664 is 466881876.

It is a self number, because there is not a number n which added to its sum of digits gives 678188664.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 790924 + ... + 791780.

Almost surely, 2^678188664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678188664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (953667000).

678188664 is an abundant number, since it is smaller than the sum of its proper divisors (1229145336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678188664 is a wasteful number, since it uses less digits than its factorization.

678188664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277 (or 1270 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 678188664 is about 26042.0556792278. The cubic root of 678188664 is about 878.5844424916.

The spelling of 678188664 in words is "six hundred seventy-eight million, one hundred eighty-eight thousand, six hundred sixty-four".