685069056 has 144 divisors (see below), whose sum is σ = 2315443200. Its totient is φ = 195720192.

The previous prime is 685069051. The next prime is 685069061. The reversal of 685069056 is 650960586.

685069056 is a `hidden beast` number, since 6 + 8 + 506 + 90 + 56 = 666.

It is an interprime number because it is at equal distance from previous prime (685069051) and next prime (685069061).

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×685069056² = 938639222977462272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685069051) 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 15 ways as a sum of consecutive naturals, for example, 41305 + ... + 55463.

Almost surely, 2^685069056 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 685069056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1157721600).

685069056 is an abundant number, since it is smaller than the sum of its proper divisors (1630374144).

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

685069056 is a wasteful number, since it uses less digits than its factorization.

685069056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14191 (or 14171 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 685069056 is about 26173.8238704244. The cubic root of 685069056 is about 881.5456033226.

The spelling of 685069056 in words is "six hundred eighty-five million, sixty-nine thousand, fifty-six".