133987760 has 20 divisors (see below), whose sum is σ = 311521728. Its totient is φ = 53595072.

The previous prime is 133987759. The next prime is 133987769. The reversal of 133987760 is 67789331.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (133987769) 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, 837344 + ... + 837503.

Almost surely, 2^133987760 is an apocalyptic number.

133987760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133987760 is an abundant number, since it is smaller than the sum of its proper divisors (177533968).

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

133987760 is a wasteful number, since it uses less digits than its factorization.

133987760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674860 (or 1674854 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 133987760 is about 11575.3082032402. The cubic root of 133987760 is about 511.7074133972.

The spelling of 133987760 in words is "one hundred thirty-three million, nine hundred eighty-seven thousand, seven hundred sixty".