685970688 has 144 divisors (see below), whose sum is σ = 1985263616. Its totient is φ = 209018880.

The previous prime is 685970651. The next prime is 685970731. The reversal of 685970688 is 886079586.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1267698 + ... + 1268238.

Almost surely, 2^685970688 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 685970688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (992631808).

685970688 is an abundant number, since it is smaller than the sum of its proper divisors (1299292928).

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

685970688 is a wasteful number, since it uses less digits than its factorization.

685970688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700 (or 686 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 57.

The square root of 685970688 is about 26191.0421327598. The cubic root of 685970688 is about 881.9321732489.

The spelling of 685970688 in words is "six hundred eighty-five million, nine hundred seventy thousand, six hundred eighty-eight".