133685568 has 84 divisors (see below), whose sum is σ = 399885408. Its totient is φ = 42620160.

The previous prime is 133685549. The next prime is 133685627. The reversal of 133685568 is 865586331.

133685568 is a `hidden beast` number, since 1 + 3 + 3 + 6 + 85 + 568 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8203 + ... + 18293.

Almost surely, 2^133685568 is an apocalyptic number.

133685568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133685568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199942704).

133685568 is an abundant number, since it is smaller than the sum of its proper divisors (266199840).

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

133685568 is a wasteful number, since it uses less digits than its factorization.

133685568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10132 (or 10119 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 133685568 is about 11562.2475323788. The cubic root of 133685568 is about 511.3224272742.

The spelling of 133685568 in words is "one hundred thirty-three million, six hundred eighty-five thousand, five hundred sixty-eight".