133881720 has 96 divisors (see below), whose sum is σ = 467240400. Its totient is φ = 30600192.

The previous prime is 133881697. The next prime is 133881767. The reversal of 133881720 is 27188331.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5505 + ... + 17264.

Almost surely, 2^133881720 is an apocalyptic number.

133881720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133881720 is an abundant number, since it is smaller than the sum of its proper divisors (333358680).

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

133881720 is a wasteful number, since it uses less digits than its factorization.

133881720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22797 (or 22786 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 133881720 is about 11570.7268570302. The cubic root of 133881720 is about 511.5723866981.

The spelling of 133881720 in words is "one hundred thirty-three million, eight hundred eighty-one thousand, seven hundred twenty".