133553220 has 24 divisors (see below), whose sum is σ = 373949184. Its totient is φ = 35614176.

The previous prime is 133553191. The next prime is 133553237. The reversal of 133553220 is 22355331.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1112884 + ... + 1113003.

It is an arithmetic number, because the mean of its divisors is an integer number (15581216).

Almost surely, 2^133553220 is an apocalyptic number.

133553220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133553220 is an abundant number, since it is smaller than the sum of its proper divisors (240395964).

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

133553220 is a wasteful number, since it uses less digits than its factorization.

133553220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225899 (or 2225897 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 24.

The square root of 133553220 is about 11556.5228334478. The cubic root of 133553220 is about 511.1536360683.

The spelling of 133553220 in words is "one hundred thirty-three million, five hundred fifty-three thousand, two hundred twenty".