133609988 has 12 divisors (see below), whose sum is σ = 233955792. Its totient is φ = 66765480.

The previous prime is 133609963. The next prime is 133609991. The reversal of 133609988 is 889906331.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1478 + ... + 16413.

It is an arithmetic number, because the mean of its divisors is an integer number (19496316).

Almost surely, 2^133609988 is an apocalyptic number.

It is an amenable number.

133609988 is a deficient number, since it is larger than the sum of its proper divisors (100345804).

133609988 is a wasteful number, since it uses less digits than its factorization.

133609988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19762 (or 19760 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 133609988 is about 11558.9786746062. The cubic root of 133609988 is about 511.2260492961.

The spelling of 133609988 in words is "one hundred thirty-three million, six hundred nine thousand, nine hundred eighty-eight".