133986728 has 16 divisors (see below), whose sum is σ = 259888500. Its totient is φ = 64683136.

The previous prime is 133986709. The next prime is 133986737. The reversal of 133986728 is 827689331.

It can be written as a sum of positive squares in 2 ways, for example, as 129914404 + 4072324 = 11398^2 + 2018^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288533 + ... + 288996.

Almost surely, 2^133986728 is an apocalyptic number.

It is an amenable number.

133986728 is a deficient number, since it is larger than the sum of its proper divisors (125901772).

133986728 is a wasteful number, since it uses less digits than its factorization.

133986728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577564 (or 577560 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The square root of 133986728 is about 11575.2636255076. The cubic root of 133986728 is about 511.7060996369.

The spelling of 133986728 in words is "one hundred thirty-three million, nine hundred eighty-six thousand, seven hundred twenty-eight".