33131228 has 12 divisors (see below), whose sum is σ = 62439720. Its totient is φ = 15291312.

The previous prime is 33131221. The next prime is 33131233. The reversal of 33131228 is 82213133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33131221) 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, 318518 + ... + 318621.

It is an arithmetic number, because the mean of its divisors is an integer number (5203310).

Almost surely, 2^33131228 is an apocalyptic number.

It is an amenable number.

33131228 is a deficient number, since it is larger than the sum of its proper divisors (29308492).

33131228 is a wasteful number, since it uses less digits than its factorization.

33131228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637156 (or 637154 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 33131228 is about 5755.9732452471. The cubic root of 33131228 is about 321.1780406787.

The spelling of 33131228 in words is "thirty-three million, one hundred thirty-one thousand, two hundred twenty-eight".