133528230 has 64 divisors (see below), whose sum is σ = 388454400. Its totient is φ = 32369760.

The previous prime is 133528223. The next prime is 133528231. The reversal of 133528230 is 32825331.

133528230 is a `hidden beast` number, since 133 + 528 + 2 + 3 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 133528194 and 133528203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133528231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19510 + ... + 25449.

It is an arithmetic number, because the mean of its divisors is an integer number (6069600).

Almost surely, 2^133528230 is an apocalyptic number.

133528230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

133528230 is an abundant number, since it is smaller than the sum of its proper divisors (254926170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133528230 is a wasteful number, since it uses less digits than its factorization.

133528230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44986 (or 44980 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 133528230 is about 11555.4415752926. The cubic root of 133528230 is about 511.1217523339.

The spelling of 133528230 in words is "one hundred thirty-three million, five hundred twenty-eight thousand, two hundred thirty".