133688528 has 10 divisors (see below), whose sum is σ = 259021554. Its totient is φ = 66844256.

The previous prime is 133688519. The next prime is 133688531. The reversal of 133688528 is 825886331.

It can be written as a sum of positive squares in only one way, i.e., 116812864 + 16875664 = 10808^2 + 4108^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4177751 + ... + 4177782.

Almost surely, 2^133688528 is an apocalyptic number.

It is an amenable number.

133688528 is a deficient number, since it is larger than the sum of its proper divisors (125333026).

133688528 is an equidigital number, since it uses as much as digits as its factorization.

133688528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8355541 (or 8355535 counting only the distinct ones).

The product of its digits is 276480, while the sum is 44.

The square root of 133688528 is about 11562.3755344652. The cubic root of 133688528 is about 511.3262010628.

The spelling of 133688528 in words is "one hundred thirty-three million, six hundred eighty-eight thousand, five hundred twenty-eight".