33642220 has 12 divisors (see below), whose sum is σ = 70648704. Its totient is φ = 13456880.

The previous prime is 33642209. The next prime is 33642221. The reversal of 33642220 is 2224633.

It is a happy number.

It is a super-2 number, since 2×33642220² = 2263597933056800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33642191 and 33642200.

It is not an unprimeable number, because it can be changed into a prime (33642221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 841036 + ... + 841075.

It is an arithmetic number, because the mean of its divisors is an integer number (5887392).

Almost surely, 2^33642220 is an apocalyptic number.

It is an amenable number.

33642220 is an abundant number, since it is smaller than the sum of its proper divisors (37006484).

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

33642220 is a wasteful number, since it uses less digits than its factorization.

33642220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1682120 (or 1682118 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 33642220 is about 5800.1913761530. The cubic root of 33642220 is about 322.8208292957.

Adding to 33642220 its reverse (2224633), we get a palindrome (35866853).

The spelling of 33642220 in words is "thirty-three million, six hundred forty-two thousand, two hundred twenty".