133555520 has 112 divisors (see below), whose sum is σ = 367466880. Its totient is φ = 45287424.

The previous prime is 133555511. The next prime is 133555531. The reversal of 133555520 is 25555331.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243887 + ... + 244433.

Almost surely, 2^133555520 is an apocalyptic number.

133555520 is a gapful number since it is divisible by the number (10) 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 133555520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183733440).

133555520 is an abundant number, since it is smaller than the sum of its proper divisors (233911360).

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

133555520 is a wasteful number, since it uses less digits than its factorization.

133555520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 29.

The square root of 133555520 is about 11556.6223439204. The cubic root of 133555520 is about 511.1565703458.

The spelling of 133555520 in words is "one hundred thirty-three million, five hundred fifty-five thousand, five hundred twenty".