133169728 has 14 divisors (see below), whose sum is σ = 264258806. Its totient is φ = 66584832.

The previous prime is 133169713. The next prime is 133169741. The reversal of 133169728 is 827961331.

It can be written as a sum of positive squares in only one way, i.e., 126157824 + 7011904 = 11232^2 + 2648^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040325 + ... + 1040452.

It is an arithmetic number, because the mean of its divisors is an integer number (18875629).

Almost surely, 2^133169728 is an apocalyptic number.

It is an amenable number.

133169728 is a deficient number, since it is larger than the sum of its proper divisors (131089078).

133169728 is an equidigital number, since it uses as much as digits as its factorization.

133169728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080789 (or 2080779 counting only the distinct ones).

The product of its digits is 54432, while the sum is 40.

The square root of 133169728 is about 11539.9188905295. The cubic root of 133169728 is about 510.6639155556.

The spelling of 133169728 in words is "one hundred thirty-three million, one hundred sixty-nine thousand, seven hundred twenty-eight".