33681228 has 72 divisors (see below), whose sum is σ = 92236032. Its totient is φ = 9565584.

The previous prime is 33681217. The next prime is 33681253. The reversal of 33681228 is 82218633.

It is a super-2 number, since 2×33681228² = 2268850239175968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201601 + ... + 201767.

It is an arithmetic number, because the mean of its divisors is an integer number (1281056).

Almost surely, 2^33681228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33681228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46118016).

33681228 is an abundant number, since it is smaller than the sum of its proper divisors (58554804).

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

33681228 is an equidigital number, since it uses as much as digits as its factorization.

33681228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 179 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 33681228 is about 5803.5530496412. The cubic root of 33681228 is about 322.9455508611.

The spelling of 33681228 in words is "thirty-three million, six hundred eighty-one thousand, two hundred twenty-eight".