133528 has 8 divisors (see below), whose sum is σ = 250380. Its totient is φ = 66760.

The previous prime is 133519. The next prime is 133541. The reversal of 133528 is 825331.

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

It is a junction number, because it is equal to n+sod(n) for n = 133499 and 133508.

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, 8338 + ... + 8353.

2¹³³⁵²⁸ is an apocalyptic number.

It is an amenable number.

133528 is a deficient number, since it is larger than the sum of its proper divisors (116852).

133528 is a wasteful number, since it uses less digits than its factorization.

133528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16697 (or 16693 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 133528 is about 365.4148327586. The cubic root of 133528 is about 51.1121458868.

Adding to 133528 its reverse (825331), we get a palindrome (958859).

The spelling of 133528 in words is "one hundred thirty-three thousand, five hundred twenty-eight".