133655820 has 24 divisors (see below), whose sum is σ = 374236464. Its totient is φ = 35641536.

The previous prime is 133655801. The next prime is 133655833. The reversal of 133655820 is 28556331.

133655820 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 7 ways as a sum of consecutive naturals, for example, 1113739 + ... + 1113858.

It is an arithmetic number, because the mean of its divisors is an integer number (15593186).

Almost surely, 2^133655820 is an apocalyptic number.

133655820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133655820 is an abundant number, since it is smaller than the sum of its proper divisors (240580644).

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

133655820 is a wasteful number, since it uses less digits than its factorization.

133655820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2227609 (or 2227607 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 133655820 is about 11560.9610327170. The cubic root of 133655820 is about 511.2844976054.

The spelling of 133655820 in words is "one hundred thirty-three million, six hundred fifty-five thousand, eight hundred twenty".