133691128 has 32 divisors (see below), whose sum is σ = 271600560. Its totient is φ = 61447680.

The previous prime is 133691099. The next prime is 133691153. The reversal of 133691128 is 821196331.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 133691093 and 133691102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5583 + ... + 17278.

Almost surely, 2^133691128 is an apocalyptic number.

It is an amenable number.

133691128 is an abundant number, since it is smaller than the sum of its proper divisors (137909432).

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

133691128 is a wasteful number, since it uses less digits than its factorization.

133691128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22927 (or 22923 counting only the distinct ones).

The product of its digits is 7776, while the sum is 34.

The square root of 133691128 is about 11562.4879675613. The cubic root of 133691128 is about 511.3295158311.

The spelling of 133691128 in words is "one hundred thirty-three million, six hundred ninety-one thousand, one hundred twenty-eight".