33133440 has 64 divisors (see below), whose sum is σ = 105618960. Its totient is φ = 8835072.

The previous prime is 33133421. The next prime is 33133481. The reversal of 33133440 is 4433133.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6709 + ... + 10548.

Almost surely, 2^33133440 is an apocalyptic number.

33133440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

33133440 is an abundant number, since it is smaller than the sum of its proper divisors (72485520).

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

33133440 is a wasteful number, since it uses less digits than its factorization.

33133440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17279 (or 17267 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 21.

The square root of 33133440 is about 5756.1653902576. The cubic root of 33133440 is about 321.1851883161.

Adding to 33133440 its reverse (4433133), we get a palindrome (37566573).

The spelling of 33133440 in words is "thirty-three million, one hundred thirty-three thousand, four hundred forty".