133655720 has 64 divisors (see below), whose sum is σ = 330091200. Its totient is φ = 48302080.

The previous prime is 133655713. The next prime is 133655741. The reversal of 133655720 is 27556331.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77912 + ... + 79608.

It is an arithmetic number, because the mean of its divisors is an integer number (5157675).

Almost surely, 2^133655720 is an apocalyptic number.

133655720 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 133655720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165045600).

133655720 is an abundant number, since it is smaller than the sum of its proper divisors (196435480).

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

133655720 is a wasteful number, since it uses less digits than its factorization.

133655720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898 (or 1894 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 32.

The square root of 133655720 is about 11560.9567078162. The cubic root of 133655720 is about 511.2843700927.

The spelling of 133655720 in words is "one hundred thirty-three million, six hundred fifty-five thousand, seven hundred twenty".