684726856 has 32 divisors (see below), whose sum is σ = 1402958880. Its totient is φ = 310710400.

The previous prime is 684726841. The next prime is 684726863. The reversal of 684726856 is 658627486.

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, 47991 + ... + 60601.

It is an arithmetic number, because the mean of its divisors is an integer number (43842465).

Almost surely, 2^684726856 is an apocalyptic number.

It is an amenable number.

684726856 is an abundant number, since it is smaller than the sum of its proper divisors (718232024).

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

684726856 is a wasteful number, since it uses less digits than its factorization.

684726856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13245 (or 13241 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 52.

The square root of 684726856 is about 26167.2859884246. The cubic root of 684726856 is about 881.3987980990.

The spelling of 684726856 in words is "six hundred eighty-four million, seven hundred twenty-six thousand, eight hundred fifty-six".