133555780 has 12 divisors (see below), whose sum is σ = 280467180. Its totient is φ = 53422304.

The previous prime is 133555739. The next prime is 133555783. The reversal of 133555780 is 87555331.

It can be written as a sum of positive squares in 2 ways, for example, as 40934404 + 92621376 = 6398^2 + 9624^2 .

It is not an unprimeable number, because it can be changed into a prime (133555783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3338875 + ... + 3338914.

It is an arithmetic number, because the mean of its divisors is an integer number (23372265).

Almost surely, 2^133555780 is an apocalyptic number.

133555780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133555780 is an abundant number, since it is smaller than the sum of its proper divisors (146911400).

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

133555780 is a wasteful number, since it uses less digits than its factorization.

133555780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6677798 (or 6677796 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 133555780 is about 11556.6335928764. The cubic root of 133555780 is about 511.1569020446.

The spelling of 133555780 in words is "one hundred thirty-three million, five hundred fifty-five thousand, seven hundred eighty".