133219428 has 12 divisors (see below), whose sum is σ = 310845360. Its totient is φ = 44406472.

The previous prime is 133219423. The next prime is 133219433. The reversal of 133219428 is 824912331.

It is an interprime number because it is at equal distance from previous prime (133219423) and next prime (133219433).

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (133219421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5550798 + ... + 5550821.

It is an arithmetic number, because the mean of its divisors is an integer number (25903780).

Almost surely, 2^133219428 is an apocalyptic number.

It is an amenable number.

133219428 is an abundant number, since it is smaller than the sum of its proper divisors (177625932).

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

133219428 is a wasteful number, since it uses less digits than its factorization.

133219428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11101626 (or 11101624 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 133219428 is about 11542.0720843356. The cubic root of 133219428 is about 510.7274355970.

The spelling of 133219428 in words is "one hundred thirty-three million, two hundred nineteen thousand, four hundred twenty-eight".