133808028 has 48 divisors (see below), whose sum is σ = 323936256. Its totient is φ = 42943680.

The previous prime is 133808023. The next prime is 133808039. The reversal of 133808028 is 820808331.

It is a self number, because there is not a number n which added to its sum of digits gives 133808028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133808023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82150 + ... + 83762.

It is an arithmetic number, because the mean of its divisors is an integer number (6748672).

Almost surely, 2^133808028 is an apocalyptic number.

It is an amenable number.

133808028 is an abundant number, since it is smaller than the sum of its proper divisors (190128228).

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

133808028 is a wasteful number, since it uses less digits than its factorization.

133808028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874 (or 1872 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 133808028 is about 11567.5420033817. The cubic root of 133808028 is about 511.4785085315.

The spelling of 133808028 in words is "one hundred thirty-three million, eight hundred eight thousand, twenty-eight".