133656728 has 32 divisors (see below), whose sum is σ = 263390160. Its totient is φ = 63504000.

The previous prime is 133656727. The next prime is 133656751. The reversal of 133656728 is 827656331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133656727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7478 + ... + 17978.

Almost surely, 2^133656728 is an apocalyptic number.

It is an amenable number.

133656728 is a deficient number, since it is larger than the sum of its proper divisors (129733432).

133656728 is a wasteful number, since it uses less digits than its factorization.

133656728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10587 (or 10583 counting only the distinct ones).

The product of its digits is 181440, while the sum is 41.

The square root of 133656728 is about 11561.0003027420. Note that the first 3 decimals coincide. The cubic root of 133656728 is about 511.2856554182.

The spelling of 133656728 in words is "one hundred thirty-three million, six hundred fifty-six thousand, seven hundred twenty-eight".