133230928 has 20 divisors (see below), whose sum is σ = 258911380. Its totient is φ = 66415104.

The previous prime is 133230919. The next prime is 133230931. The reversal of 133230928 is 829032331.

It can be written as a sum of positive squares in 2 ways, for example, as 62536464 + 70694464 = 7908^2 + 8408^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 133230928.

It is a congruent number.

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, 6963 + ... + 17746.

It is an arithmetic number, because the mean of its divisors is an integer number (12945569).

Almost surely, 2^133230928 is an apocalyptic number.

It is an amenable number.

133230928 is a deficient number, since it is larger than the sum of its proper divisors (125680452).

133230928 is a wasteful number, since it uses less digits than its factorization.

133230928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25054 (or 25048 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 133230928 is about 11542.5702510316. The cubic root of 133230928 is about 510.7421311426.

The spelling of 133230928 in words is "one hundred thirty-three million, two hundred thirty thousand, nine hundred twenty-eight".