133305520 has 40 divisors (see below), whose sum is σ = 326251440. Its totient is φ = 50515200.

The previous prime is 133305511. The next prime is 133305533. The reversal of 133305520 is 25503331.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 133305491 and 133305500.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42331 + ... + 45370.

It is an arithmetic number, because the mean of its divisors is an integer number (8156286).

Almost surely, 2^133305520 is an apocalyptic number.

133305520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133305520 is an abundant number, since it is smaller than the sum of its proper divisors (192945920).

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

133305520 is a wasteful number, since it uses less digits than its factorization.

133305520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87733 (or 87727 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 22.

The square root of 133305520 is about 11545.8009683174. The cubic root of 133305520 is about 510.8374297593.

Adding to 133305520 its reverse (25503331), we get a palindrome (158808851).

The spelling of 133305520 in words is "one hundred thirty-three million, three hundred five thousand, five hundred twenty".