133280428 has 12 divisors (see below), whose sum is σ = 234919720. Its totient is φ = 66160512.

The previous prime is 133280393. The next prime is 133280447. The reversal of 133280428 is 824082331.

It is a self number, because there is not a number n which added to its sum of digits gives 133280428.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119301 + ... + 120412.

Almost surely, 2^133280428 is an apocalyptic number.

It is an amenable number.

133280428 is a deficient number, since it is larger than the sum of its proper divisors (101639292).

133280428 is a wasteful number, since it uses less digits than its factorization.

133280428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239856 (or 239854 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 133280428 is about 11544.7142883659. The cubic root of 133280428 is about 510.8053762301.

The spelling of 133280428 in words is "one hundred thirty-three million, two hundred eighty thousand, four hundred twenty-eight".