685709916 has 12 divisors (see below), whose sum is σ = 1599989832. Its totient is φ = 228569968.

The previous prime is 685709911. The next prime is 685709963. The reversal of 685709916 is 619907586.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685709911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28571235 + ... + 28571258.

It is an arithmetic number, because the mean of its divisors is an integer number (133332486).

Almost surely, 2^685709916 is an apocalyptic number.

It is an amenable number.

685709916 is an abundant number, since it is smaller than the sum of its proper divisors (914279916).

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

685709916 is a wasteful number, since it uses less digits than its factorization.

685709916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57142500 (or 57142498 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 51.

The square root of 685709916 is about 26186.0633925758. The cubic root of 685709916 is about 881.8204034753.

The spelling of 685709916 in words is "six hundred eighty-five million, seven hundred nine thousand, nine hundred sixteen".