686816696 has 8 divisors (see below), whose sum is σ = 1287781320. Its totient is φ = 343408344.

The previous prime is 686816659. The next prime is 686816719. The reversal of 686816696 is 696618686.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42926036 + ... + 42926051.

It is an arithmetic number, because the mean of its divisors is an integer number (160972665).

Almost surely, 2^686816696 is an apocalyptic number.

It is an amenable number.

686816696 is a deficient number, since it is larger than the sum of its proper divisors (600964624).

686816696 is a wasteful number, since it uses less digits than its factorization.

686816696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85852093 (or 85852089 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 56.

The square root of 686816696 is about 26207.1878689798. The cubic root of 686816696 is about 882.2945867681.

The spelling of 686816696 in words is "six hundred eighty-six million, eight hundred sixteen thousand, six hundred ninety-six".