133688220 has 24 divisors (see below), whose sum is σ = 374327184. Its totient is φ = 35650176.

The previous prime is 133688197. The next prime is 133688227. The reversal of 133688220 is 22886331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133688227) 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, 1114009 + ... + 1114128.

It is an arithmetic number, because the mean of its divisors is an integer number (15596966).

Almost surely, 2^133688220 is an apocalyptic number.

133688220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133688220 is an abundant number, since it is smaller than the sum of its proper divisors (240638964).

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

133688220 is a wasteful number, since it uses less digits than its factorization.

133688220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228149 (or 2228147 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 133688220 is about 11562.3622153953. The cubic root of 133688220 is about 511.3258083874.

The spelling of 133688220 in words is "one hundred thirty-three million, six hundred eighty-eight thousand, two hundred twenty".