685357056 has 216 divisors, whose sum is σ = 2109383640. Its totient is φ = 214327296.

The previous prime is 685357051. The next prime is 685357061. The reversal of 685357056 is 650753586.

685357056 is a `hidden beast` number, since 68 + 535 + 7 + 0 + 56 = 666.

It is an interprime number because it is at equal distance from previous prime (685357051) and next prime (685357061).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685357051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6653901 + ... + 6654003.

It is an arithmetic number, because the mean of its divisors is an integer number (9765665).

Almost surely, 2^685357056 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 685357056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1054691820).

685357056 is an abundant number, since it is smaller than the sum of its proper divisors (1424026584).

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

685357056 is a wasteful number, since it uses less digits than its factorization.

685357056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The square root of 685357056 is about 26179.3249721990. The cubic root of 685357056 is about 881.6691186395.

The spelling of 685357056 in words is "six hundred eighty-five million, three hundred fifty-seven thousand, fifty-six".