33223640 has 16 divisors (see below), whose sum is σ = 74753280. Its totient is φ = 13289440.

The previous prime is 33223639. The next prime is 33223643. The reversal of 33223640 is 4632233.

It is a super-2 number, since 2×33223640² = 2207620509699200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33223643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415256 + ... + 415335.

It is an arithmetic number, because the mean of its divisors is an integer number (4672080).

Almost surely, 2^33223640 is an apocalyptic number.

It is an amenable number.

33223640 is an abundant number, since it is smaller than the sum of its proper divisors (41529640).

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

33223640 is a wasteful number, since it uses less digits than its factorization.

33223640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830602 (or 830598 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 23.

The square root of 33223640 is about 5763.9951422603. The cubic root of 33223640 is about 321.4763810836.

Adding to 33223640 its reverse (4632233), we get a palindrome (37855873).

The spelling of 33223640 in words is "thirty-three million, two hundred twenty-three thousand, six hundred forty".