33381228 has 24 divisors (see below), whose sum is σ = 78000832. Its totient is φ = 11111184.

The previous prime is 33381223. The next prime is 33381241. The reversal of 33381228 is 82218333.

It is a super-2 number, since 2×33381228² = 2228612765575968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33381195 and 33381204.

It is not an unprimeable number, because it can be changed into a prime (33381223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9351 + ... + 12417.

Almost surely, 2^33381228 is an apocalyptic number.

It is an amenable number.

33381228 is an abundant number, since it is smaller than the sum of its proper divisors (44619604).

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

33381228 is a wasteful number, since it uses less digits than its factorization.

33381228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3981 (or 3979 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 33381228 is about 5777.6490028384. The cubic root of 33381228 is about 321.9838604104.

The spelling of 33381228 in words is "thirty-three million, three hundred eighty-one thousand, two hundred twenty-eight".