133597228 has 12 divisors (see below), whose sum is σ = 241337152. Its totient is φ = 64643760.

The previous prime is 133597223. The next prime is 133597231. The reversal of 133597228 is 822795331.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (133597223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538575 + ... + 538822.

Almost surely, 2^133597228 is an apocalyptic number.

It is an amenable number.

133597228 is a deficient number, since it is larger than the sum of its proper divisors (107739924).

133597228 is a wasteful number, since it uses less digits than its factorization.

133597228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077432 (or 1077430 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The square root of 133597228 is about 11558.4267095483. The cubic root of 133597228 is about 511.2097744349.

The spelling of 133597228 in words is "one hundred thirty-three million, five hundred ninety-seven thousand, two hundred twenty-eight".