33220816 has 20 divisors (see below), whose sum is σ = 67753600. Its totient is φ = 15736032.

The previous prime is 33220793. The next prime is 33220841. The reversal of 33220816 is 61802233.

It is a super-2 number, since 2×33220816² = 2207245231411712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54336 + ... + 54943.

It is an arithmetic number, because the mean of its divisors is an integer number (3387680).

Almost surely, 2^33220816 is an apocalyptic number.

It is an amenable number.

33220816 is an abundant number, since it is smaller than the sum of its proper divisors (34532784).

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

33220816 is a wasteful number, since it uses less digits than its factorization.

33220816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109306 (or 109300 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 33220816 is about 5763.7501680763. The cubic root of 33220816 is about 321.4672723583.

The spelling of 33220816 in words is "thirty-three million, two hundred twenty thousand, eight hundred sixteen".