133428447 has 12 divisors (see below), whose sum is σ = 194718160. Its totient is φ = 88034688.

The previous prime is 133428443. The next prime is 133428481. The reversal of 133428447 is 744824331.

133428447 is a `hidden beast` number, since 1 + 334 + 284 + 47 = 666.

It is not a de Polignac number, because 133428447 - 2² = 133428443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133428443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75547 + ... + 77292.

Almost surely, 2^133428447 is an apocalyptic number.

133428447 is a deficient number, since it is larger than the sum of its proper divisors (61289713).

133428447 is a wasteful number, since it uses less digits than its factorization.

133428447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152942 (or 152939 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 133428447 is about 11551.1231921402. The cubic root of 133428447 is about 510.9944035549.

It can be divided in two parts, 1334284 and 47, that added together give a palindrome (1334331).

The spelling of 133428447 in words is "one hundred thirty-three million, four hundred twenty-eight thousand, four hundred forty-seven".