133800660 has 384 divisors, whose sum is σ = 528998400. Its totient is φ = 27713664.

The previous prime is 133800629. The next prime is 133800677. The reversal of 133800660 is 66008331.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5817409 + ... + 5817431.

It is an arithmetic number, because the mean of its divisors is an integer number (1377600).

Almost surely, 2^133800660 is an apocalyptic number.

133800660 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 133800660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264499200).

133800660 is an abundant number, since it is smaller than the sum of its proper divisors (395197740).

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

133800660 is a wasteful number, since it uses less digits than its factorization.

133800660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 133800660 is about 11567.2235216581. The cubic root of 133800660 is about 511.4691203484.

Adding to 133800660 its reverse (66008331), we get a palindrome (199808991).

The spelling of 133800660 in words is "one hundred thirty-three million, eight hundred thousand, six hundred sixty".