133394728 has 8 divisors (see below), whose sum is σ = 250115130. Its totient is φ = 66697360.

The previous prime is 133394719. The next prime is 133394741. The reversal of 133394728 is 827493331.

It can be written as a sum of positive squares in only one way, i.e., 72897444 + 60497284 = 8538^2 + 7778^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8337163 + ... + 8337178.

Almost surely, 2^133394728 is an apocalyptic number.

It is an amenable number.

133394728 is a deficient number, since it is larger than the sum of its proper divisors (116720402).

133394728 is a wasteful number, since it uses less digits than its factorization.

133394728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16674347 (or 16674343 counting only the distinct ones).

The product of its digits is 108864, while the sum is 40.

The square root of 133394728 is about 11549.6635448830. The cubic root of 133394728 is about 510.9513550838.

The spelling of 133394728 in words is "one hundred thirty-three million, three hundred ninety-four thousand, seven hundred twenty-eight".