133489728 has 112 divisors (see below), whose sum is σ = 398637760. Its totient is φ = 43794432.

The previous prime is 133489717. The next prime is 133489739. The reversal of 133489728 is 827984331.

It is an interprime number because it is at equal distance from previous prime (133489717) and next prime (133489739).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115200 + ... + 116352.

Almost surely, 2^133489728 is an apocalyptic number.

133489728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133489728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199318880).

133489728 is an abundant number, since it is smaller than the sum of its proper divisors (265148032).

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

133489728 is a wasteful number, since it uses less digits than its factorization.

133489728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241 (or 1225 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 133489728 is about 11553.7754868268. The cubic root of 133489728 is about 511.0726213962.

The spelling of 133489728 in words is "one hundred thirty-three million, four hundred eighty-nine thousand, seven hundred twenty-eight".