678768864 has 48 divisors (see below), whose sum is σ = 1783192320. Its totient is φ = 226075520.

The previous prime is 678768859. The next prime is 678768907. The reversal of 678768864 is 468867876.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 678768798 and 678768807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177727 + ... + 181505.

It is an arithmetic number, because the mean of its divisors is an integer number (37149840).

Almost surely, 2^678768864 is an apocalyptic number.

It is an amenable number.

678768864 is an abundant number, since it is smaller than the sum of its proper divisors (1104423456).

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

678768864 is a wasteful number, since it uses less digits than its factorization.

678768864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5663 (or 5655 counting only the distinct ones).

The product of its digits is 21676032, while the sum is 60.

The square root of 678768864 is about 26053.1929713039. The cubic root of 678768864 is about 878.8349182182.

The spelling of 678768864 in words is "six hundred seventy-eight million, seven hundred sixty-eight thousand, eight hundred sixty-four".