33220638 has 32 divisors (see below), whose sum is σ = 80536320. Its totient is φ = 10066680.

The previous prime is 33220637. The next prime is 33220643. The reversal of 33220638 is 83602233.

33220638 is a `hidden beast` number, since 3 + 3 + 2 + 20 + 638 = 666.

It is a super-2 number, since 2×33220638² = 2207221578254088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33220637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27370 + ... + 28557.

It is an arithmetic number, because the mean of its divisors is an integer number (2516760).

Almost surely, 2^33220638 is an apocalyptic number.

33220638 is an abundant number, since it is smaller than the sum of its proper divisors (47315682).

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

33220638 is a wasteful number, since it uses less digits than its factorization.

33220638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55949 (or 55943 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 33220638 is about 5763.7347267202. The cubic root of 33220638 is about 321.4666982075.

The spelling of 33220638 in words is "thirty-three million, two hundred twenty thousand, six hundred thirty-eight".