33981228 has 24 divisors (see below), whose sum is σ = 88099760. Its totient is φ = 11327040.

The previous prime is 33981217. The next prime is 33981229. The reversal of 33981228 is 82218933.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 33981192 and 33981201.

It is not an unprimeable number, because it can be changed into a prime (33981229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157213 + ... + 157428.

Almost surely, 2^33981228 is an apocalyptic number.

It is an amenable number.

33981228 is an abundant number, since it is smaller than the sum of its proper divisors (54118532).

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

33981228 is a wasteful number, since it uses less digits than its factorization.

33981228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314654 (or 314646 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 33981228 is about 5829.3419868798. The cubic root of 33981228 is about 323.9015475902.

The spelling of 33981228 in words is "thirty-three million, nine hundred eighty-one thousand, two hundred twenty-eight".