678968064 has 108 divisors (see below), whose sum is σ = 1990136512. Its totient is φ = 222566400.

The previous prime is 678968033. The next prime is 678968089. The reversal of 678968064 is 460869876.

It is a self number, because there is not a number n which added to its sum of digits gives 678968064.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138129 + ... + 142959.

Almost surely, 2^678968064 is an apocalyptic number.

678968064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678968064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (995068256).

678968064 is an abundant number, since it is smaller than the sum of its proper divisors (1311168448).

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

678968064 is a wasteful number, since it uses less digits than its factorization.

678968064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4914 (or 4897 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The square root of 678968064 is about 26057.0156387872. The cubic root of 678968064 is about 878.9208811049.

The spelling of 678968064 in words is "six hundred seventy-eight million, nine hundred sixty-eight thousand, sixty-four".