133333328 has 20 divisors (see below), whose sum is σ = 258540000. Its totient is φ = 66613344.

The previous prime is 133333327. The next prime is 133333357. The reversal of 133333328 is 823333331.

It is a self number, because there is not a number n which added to its sum of digits gives 133333328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133333327) 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, 24173 + ... + 29171.

It is an arithmetic number, because the mean of its divisors is an integer number (12927000).

Almost surely, 2^133333328 is an apocalyptic number.

It is an amenable number.

133333328 is a deficient number, since it is larger than the sum of its proper divisors (125206672).

133333328 is a wasteful number, since it uses less digits than its factorization.

133333328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6674 (or 6668 counting only the distinct ones).

The product of its digits is 11664, while the sum is 29.

The square root of 133333328 is about 11547.0051528524. The cubic root of 133333328 is about 510.8729481174.

Adding to 133333328 its reverse (823333331), we get a palindrome (956666659).

It can be divided in two parts, 13333 and 3328, that added together give a palindrome (16661).

The spelling of 133333328 in words is "one hundred thirty-three million, three hundred thirty-three thousand, three hundred twenty-eight".