133391928 has 32 divisors (see below), whose sum is σ = 353097360. Its totient is φ = 41848320.

The previous prime is 133391897. The next prime is 133391941. The reversal of 133391928 is 829193331.

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, 163063 + ... + 163878.

Almost surely, 2^133391928 is an apocalyptic number.

It is an amenable number.

133391928 is an abundant number, since it is smaller than the sum of its proper divisors (219705432).

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

133391928 is a wasteful number, since it uses less digits than its factorization.

133391928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326967 (or 326963 counting only the distinct ones).

The product of its digits is 34992, while the sum is 39.

The square root of 133391928 is about 11549.5423285947. The cubic root of 133391928 is about 510.9477800455.

The spelling of 133391928 in words is "one hundred thirty-three million, three hundred ninety-one thousand, nine hundred twenty-eight".