678706704 has 135 divisors (see below), whose sum is σ = 2069175693. Its totient is φ = 207582336.

The previous prime is 678706627. The next prime is 678706729. The reversal of 678706704 is 407607876.

The square root of 678706704 is 26052.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 100400400 + 578306304 = 10020^2 + 24048^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 678706704.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4064029 + ... + 4064195.

Almost surely, 2^678706704 is an apocalyptic number.

678706704 is the 26052-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678706704

678706704 is an abundant number, since it is smaller than the sum of its proper divisors (1390468989).

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

678706704 is a wasteful number, since it uses less digits than its factorization.

678706704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 45.

The cubic root of 678706704 is about 878.8080902118.

The spelling of 678706704 in words is "six hundred seventy-eight million, seven hundred six thousand, seven hundred four".