33243540 has 144 divisors (see below), whose sum is σ = 108144960. Its totient is φ = 7603200.

The previous prime is 33243527. The next prime is 33243593. The reversal of 33243540 is 4534233.

It is a super-2 number, since 2×33243540² = 2210265903463200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 33243540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 137820 + ... + 138060.

Almost surely, 2^33243540 is an apocalyptic number.

33243540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33243540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54072480).

33243540 is an abundant number, since it is smaller than the sum of its proper divisors (74901420).

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

33243540 is a wasteful number, since it uses less digits than its factorization.

33243540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 24.

The square root of 33243540 is about 5765.7211170850. The cubic root of 33243540 is about 321.5405532927.

Adding to 33243540 its reverse (4534233), we get a palindrome (37777773).

The spelling of 33243540 in words is "thirty-three million, two hundred forty-three thousand, five hundred forty".